Brake caliper repair kits

Tags: #front-axle · #rear-axle · #part-number

Front caliper repair kits

Two main options reported for a front caliper rebuild: - B5CA0339KIT — full FAW-direct kit with piston, seals/rubbers, sold by Kitzapchasti and similar resellers.¹² - FC01-3501010-1 — cross-fit kit from the Besturn B50 parts family, reported as usable on X80 front calipers.¹ - Generic repair kit combined with a separate MASUMA MBC-0008 piston is also reported as a working combination.¹ - Guide-pins-only kit: B5CA0339NAP (no piston/seals, just the pin hardware) — useful if only the guide pins need replacing.³² - Separately, a front caliper guide (lower mount) repair kit is sold via Kitparts for 1,390 RUB (RU market, May 2025); addresses squeaking and misalignment caused by worn lower-guide bushings specifically (narrower scope than the full B5CA0339KIT above).⁴⁵

Sourcing note: КитЗапчасти (Kitzapchasti) sources parts from the Chinese factory supplier GiKong, the same factory that supplies FAW itself for many parts — pricing runs roughly 30% below official dealer rates, but quality is reported as variable batch-to-batch.⁶⁷

Right front caliper bracket (restyle) is not sold as a separate part on the market as of this reporting. Workarounds: (1) source a used/salvage caliper assembly; (2) buy a complete new caliper assembly instead of just the bracket; (3) try a Mazda caliper as a possible cross-fit — compatibility is unconfirmed, so verify before committing; (4) use the guide-pins-only kit above if the bracket itself is intact and only the pins are worn.⁸⁹¹⁰³²

Rear caliper repair kits and sourcing

• B5CA02646Z — rear caliper repair kit (seals, springs, piston components), sold by Kitzapchasti for ~2,000–2,080 RUB (RU market, late 2024/April 2025 pricing); this is the standard rebuild option for a serviceable caliper.^11121314
• If the caliper body itself is damaged beyond a rebuild, owners source used complete calipers via marketplaces like Avito (regional availability, e.g. Magnitogorsk in one case), or buy new complete calipers at higher cost.^15161718
• General guidance from owners: don't economize on brake components — prefer a proper rebuild kit or known-quality parts over the cheapest Chinese alternative, given the safety-critical nature of the part.¹²

Guide pins (both axles)

Rear caliper guide pins ("направляющие"/slide pins) are steel rods with rubber sleeve bushings, distinct from the piston/seal kit above. FAW Besturn B50 rear caliper guide pin kit, part FC01-3502036, includes the rubber sleeves and steel rods and is reported as cross-fitting X80; similar guide-pin kits are also listed directly for X80 on Ozon.¹⁹²⁰

Maintenance rule: guide pins should move freely. If a pin is seized (common after water exposure/corrosion), it must be extracted, cleaned, and re-lubricated — some owners do this without replacing the pin/kit at all, since the pin itself is often fine once de-rusted.²¹

Cleaning/rust-treatment procedure (applies to both axles): remove the pads, extract both guide pins (note: the two pins on one caliper often have different construction/length — track which goes where), wire-brush off rust, then apply fresh brake-system-safe (PAG) grease and an anti-corrosion grease (MS1600 specifically recommended) to the working surfaces before reinstalling. Inspect the rubber dust boot for tears — a torn boot is what let water/grit in and caused the rust in the first place. When reinstalling pads, the ground/contact-end rivets can be filed smooth to avoid damaging the dust boot on reassembly. If a disc is seized/rust-stuck to the hub during this work, use a proper mechanical brake-disc puller tool, not a hammer.^2223242526

Rear caliper piston: screw-in design, not push-back

Unlike many hydraulic calipers where the piston simply pushes back into the bore, the X80's rear caliper piston screws in (rotates clockwise into the caliper body) as it retracts — pushing on it directly does nothing.²⁷²⁸²⁹ Correct retraction requires a dedicated screw-in tool: a T-shaped wrench with perpendicular handles and a calibrated depth stop, used to rotate the piston in to the correct depth for the new (thicker) pads.³⁰³¹ (See the electronic-parking-brake card for how this piston retraction fits into the overall rear-pad-replacement sequence, including the debate over whether a plain scan-tool "release" is enough on its own.)

After retracting/reinstalling, the brake shoe/pad wear sensor should be reset through the vehicle's diagnostic menu if the car has one, rather than left unreset.³²

Rear disc overheating — guide-pin/boot diagnosis

Intermittent overheating of a rear disc (one side noticeably hotter than the other after driving) is typically caused by one of: (1) a stuck guide pin or torn dust boot on that caliper (most common — water exposure can corrode/seize a pin, as in a documented case at ~40,000 km); (2) contaminated brake fluid or a sticking cylinder; or (3) a collapsed brake hose restricting fluid return. Because guide-pin seizure is the most common cause, owners recommend servicing the guide pins and dust boots every time the pads are replaced, as routine preventive maintenance.^333435363738

Rear piston retraction — additional tools and methods

Beyond the dedicated screw-in tool described above: a specialized tool costing ~600 RUB (RU market, June 2025), or a bolt wrench from a grinder/angle grinder used manually (rotate clockwise one full turn while pushing inward), both work for the rear piston retraction. Total job time typically 30 minutes to 1 hour.^3940414243 A separate, non-screw-in method reported for the rear piston: connect two wires to the battery with reversed polarity on the rear caliper to drive the piston back; alternatively, use the electric parking brake system itself (press the brake pedal and the parking-brake button simultaneously) to retract it. A third method involves a specific button-press sequence. The reversed-polarity wire method is reported as the most reliable for manual control (see the electronic-parking-brake card for the button-sequence release procedures in full).^44454647

Front caliper cross-fit from Mazda 6 GH, rear seals from Suzuki (community shop report)

• Front caliper pins and seals from Mazda 6 GH (2008–2013, 2.0L) fit the X80 front calipers — confirmed by an owner who also notes the pins themselves weren't purchased separately, only the rubber seals, which fit and "means it should work."^{48495051525354} One owner initially received an incorrectly-labeled "Lynx" branded part at a market stall claimed to be for Mazda CX-5 that turned out not to be the right part — verify the actual cross-reference rather than trusting a seller's verbal claim.⁵⁵
• Rear caliper seals from Suzuki Grand Vitara reportedly used in some repair shops as an alternative, per an invoice/accumulation record seen by a community member — an unverified but plausible cross-fit worth checking against exact dimensions before ordering.⁴⁸

MasterKit 77A1188 — front repair kit with grease notes (Aug 2025)

MasterKit 77A1188 front caliper repair kit (piston seal, dust boot, and guide-pin seals — "resinки"/rubbers) documented with part numbers found via Ozon marketplace. Caliper guide pins are directional and have specific dimensions that must be verified during rebuild. High-temperature anti-squeal grease and caliper guide-pin grease should both be applied during installation.⁵⁶⁵⁷⁵⁸ (See also the Zekkert BR-1325 entry below, which is compared directly against this same 77A1188 kit.)

KitParts vs Kitzap — piston sizing reliability

For front caliper rebuild kits specifically, Kitzap-sourced kits often have piston diameters that don't fit (too small); KitParts brand is recommended instead, though it may have a longer lead time. Community recommendation: contact community member mastergtr75 for sourcing assistance if stuck.^59606162

Front caliper piston cross-compat: Nissan Qashqai / Mazda CX-5

OEM X80 front caliper pistons can be replaced with parts from Nissan Qashqai J10 or Mazda CX-5 T31, with proper verification of diameter and height. One owner tested Zekkert-brand repair kits from Ozon: one size (labeled for QASHQAI/CX-5) worked with correct dimensions, while another, smaller piston from the same brand line did not fit — measure with calipers before purchase rather than trusting the listing.^{63646566676869}

Front seal kits and dust boots — additional cross-references

• Front brake caliper seal kit (seals + piston): part numbers B5CA0339RK or B5CA02646Z (note: B5CA02646Z is the same number documented elsewhere in this card as the standard rear kit — treat with care and verify axle/product category before ordering). Compatible cross-brand alternatives reported available from Gazelle and FAW Besturn B50 models, including rubber seals and piston.^{70717273747576}
• Brake dust boot (SHRUS-type outer boot): part B5DA122530. Multiple suppliers carry these; a Lanos-sourced dust boot has also been fitted successfully by one owner when the OEM part wasn't in stock locally.^73747576

Zekkert BR-1325 — front repair kit cross-brand alternative

Zekkert BR-1325 caliper rebuild kit (designed for Mazda CX-5, X-Trail T31, Qashqai J10) has been fitted successfully to X80 front calipers by community members; community consensus treats this as a proven compatible alternative. The native part number 77A1188 (Masterkit brand, see above) is also viable at a lower cost (~350 RUB; RU market, March 2026) but is less tested than the Zekkert option.^7778798081

Caliper repair kit seal failure — real-world consequence

Aftermarket brake caliper repair kits (ремкомплект) can have seals that fail under load. One reported case: the piston seized and the brake disc overheated during highway driving, requiring a full caliper replacement (2 discs + 2 calipers) — a costly outcome from a cheap kit. OEM or proven aftermarket parts are recommended over unverified repair kits for this reason.⁸²⁸³

Complete front caliper — OEM part number and pricing (Jul 2026)

• Factory FAW front caliper (left/right, суппорт тормозной передний): article B5CA03399ZA. Price: 35,420 RUB (Jul 2026) from Russian parts distributors, with standard 5–7 day delivery to Moscow.⁸⁴
• Pricing tiers reported across the community (Jul 2026): OEM (B5CA03399ZA) 35,420 RUB; branded/OEM-adjacent alternatives 12,000–18,000 RUB; historical pricing as low as ~11,000 RUB, with a peak around ~28,000 RUB — significant variance across sources and quality tiers, so shop around rather than assuming one price.⁸⁵⁸⁶⁸⁴

MASUMA MBC-0008 piston — reconfirmed

The MASUMA MBC-0008 piston (already documented above as a compatible front-caliper piston option) is independently reconfirmed by two further community reports as the recommended piston when rebuilding or replacing front brake cylinders.⁸⁷⁸⁸

Front dust boot — Lancer cross-fit (stretch fit)

Separately from the SHRUS-type boot above, the front caliper piston dust boot can also be sourced from Lancer models as a cross-fit; it requires some stretching to fit and the original/stock part is still preferred when available.⁸⁹

Front repair kit — FAW Besturn B50, part FC013501020

Front brake caliper repair kit (seals and piston) FAW Besturn B50 part FC013501020 is compatible with the X80 — B50 front-axle brake components are broadly interchangeable with X80 (consistent with the B50 cross-fit notes elsewhere in this card). Sourceable from Chinese parts suppliers such as kitzapchasti.ru.⁹⁰ The reverse is also reported: when a search returned the B50 kit FC013501020, one member said it does not fit the X80, and the X80 front kit is listed as B5CA0339KIT (rubbers, piston and seals).⁹¹⁹²

Front piston boot sourcing and early MasterKit 77A1188 reports (Jul–Aug 2024)

OEM front/rear caliper piston boot: part B5CA03326X — one article for both front and rear, reported in stock at the dealer.⁹³ Cross-brand alternative reported to fit better than OEM (the OEM boot runs oversized): MasterKit 77A1188 (for Mazda 6 GH, 2007–2013, 2.0L), available on Ozon.^94959697 This is an earlier, independent field confirmation of the same 77A1188 kit documented in more detail elsewhere in this card (see the Aug 2025 grease-notes section and the Zekkert BR-1325 comparison below) — another owner separately confirmed this exact kit "fits perfectly."⁹⁸⁹⁹ Mazda 6 GG (2.0L) calipers themselves may also be compatible on some X80 models.^94959697

A third report from the same period found Frenkit-brand front caliper repair kits fit well and are readily available; separately, a Mazda GH 2.0L caliper repair kit (ordered from an online catalog) also fits X80 front calipers and reportedly seats tighter/better than the original. Before committing to a full kit, check the caliper cylinder for rust/wear — sometimes only the gaskets need replacing.^100101102103 The MasterKit 77A1188 kit (gaskets and seals) is available via Ozon: https://ozon.ru/t/LydBM6D.¹⁰¹

Rear caliper piston corrosion repair — sandpaper/grease method

A seized rear caliper piston with light surface corrosion can usually be restored rather than replaced: disassemble the caliper, inspect the piston (light surface rust is acceptable), clean it with 0-grit sandpaper, and apply caliper-guide grease under the dust boots. Use a full repair kit with a replacement piston only if the corrosion is severe. Full caliper replacement is unnecessary in most cases — repair kits run roughly 6,000–7,000 RUB (RU market, Sept 2024) at an independent shop vs. 10,000–12,000 RUB at an official dealer (RU market, Sept 2024 pricing, Irkutsk region); availability and pricing for specific caliper models vary by region.^104105106

Early field reports: screw-in rear piston, rear kit part number, and no-battery release (Mar 2024)

Independent early confirmation of the rear caliper's screw-in piston design (see the dedicated section above): the piston must be rotated in, not pushed — the caliper should be cleaned, guides lubricated, and a possible air lock in the caliper checked if the piston won't budge.^107108109 For the motorized (rest/facelift AKPP) parking-brake caliper specifically, one method reported: disconnect the motor's electrical connector and apply battery voltage directly to the two motor contacts to drive the piston in/out — an alternative to the screw-in tool, requiring no special tooling beyond jumper wires.¹¹⁰¹¹¹ Manual methods (turning the piston by hand or with a generic adapter) are also reported.¹¹² After any of these rear-piston service methods, a brake adaptation procedure is needed before the system is fully functional again.^{107108109110111112}

Separately, an early record of the same B5CA02646Z rear caliper repair kit documented elsewhere in this card: sourced from kitzapchasti.ru.¹¹³ A kitparts listing for the X80 rear brake gives B5CA02646Z as the caliper repair kit but titles it as the front caliper kit; the B50 rear caliper kit is FC013502010 / FC013502020 (seals and piston).¹¹⁴¹¹⁵

Rear caliper — cylinder is not a separate part (independent corroboration)

A separate community group corroborates the rear caliper design already noted above: the rear caliper cylinder (задний суппорт) is not sold as a standalone part — it is integrated with the caliper body and bracket. Only the internal piston and seals can be replaced through disassembly. If the seals leak or the piston is scored, an internal overhaul is attempted first; if damage is severe, the entire caliper assembly must be replaced — there is no way to buy just the cylinder.^{116117118119120121}

Uneven rear pad wear — guide-pin/piston-seal diagnosis (independent report)

Consistent with the guide-pin/dust-boot diagnosis documented above for disc overheating, a separate report describes one rear pad (e.g. left rear) wearing much faster than its pair: likely causes are a degraded piston seal in the brake cylinder or a worn/corroded caliper guide. Diagnostic steps: check the piston seal condition and guide cleanliness/lubrication before assuming a caliper or suspension fault.^122123124

MasterKit 77A1188 fitted; guide kit 77A1538 (Aug–Oct 2025)

One owner fitted the MasterKit 77A1188 caliper repair kit: all the rubbers fit and the piston is included in the kit; the Ozon listing was posted again in October 2025.¹²⁵¹²⁶ For the guide pins, MasterKit 77A1538 (caliper guide kit, Mazda 6 GH) was listed on Ozon in August 2025.¹²⁷

Media

Online catalog screenshot from kitzapchasty.ru showing FAW Besturn X80 front brake caliper listing, part number B5CA03399ZA, brand FAW, OEM price 35420 RUB, availability status and 5-7 day delivery to Moscow

Caliper piston size comparison: new Zekkert piston (left, smaller) vs OEM piston (right, larger), demonstrating the need to verify piston dimensions before buying a Nissan Qashqai/Mazda CX-5 cross-fit piston

Specialized T-shaped tool with perpendicular handles and a calibrated depth-stop fixture, used to screw the rear caliper piston in to the correct depth for new pads

Related pages

• Brake pads, discs & caliper parts
• Brake pad noise and quality
• Drilled and perforated brake discs
• Front brake pads
• Front brake discs

Sources

This page is compiled from 127 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-10-29