6371 brake caliper rubber parts

6371 brake caliper rubber parts (universal Wuling Zhiguang 6371/6376/6388/6390/6400 series), suitable for front wheel single piston floating calipers, with a standard size of 57mm piston cylinder diameter, is one of the commonly used brake caliper repair kits in the microvan market.

1、 Standard repair kit components (front wheels)

Piston main sealing ring (rectangular/square)

Size: Ø 57mm

Function: High pressure sealed brake fluid, providing piston return force to prevent drag braking

Failure: Oil leakage, brake softness, piston sticking

Piston dust cover (corrugated)

Function: Isolate sediment and water vapor, protect the piston and cylinder wall

Failure: rupture and ash ingress → piston strain, jamming, abnormal noise

Guide pin (sliding pin) dust cover+liner

Function: Protect the floating caliper guide pin, prevent corrosion (based on actual reports), and prevent sedimentation

Failure: Rusted guide pin → Brake pad eccentric wear, eccentric braking, wheel heating

2、 Material standards

Required: EPDM (Ethylene Propylene Diene Monomer Rubber)

Resistant to DOT3/DOT4 brake fluid, working temperature -40 ℃~135 ℃, aging resistance, non swelling

Compatible with Wuling Zhiguang original factory and reputable calipers such as ATE and TRW

Strictly prohibited: NBR (nitrile rubber)

Not resistant to synthetic brake fluid, prone to swelling, softening, and oil leakage, strictly prohibited for use in brake systems

3、 Applicable vehicle models and systems

Wuling Light: 6371, 6376, 6388, 6390, 6400, Yangguang

Wuling Rongguang/Xiaoka: Some early models (front disc brake models)

Dongfeng Xiaokang/Chang'an Star: Partial same platform microvans (universal for front distribution pumps)

System: Single piston, floating, 57mm cylinder diameter front brake caliper

4、 Common faults and signal replacement

Caliper oil leakage: there are yellow/red brake fluid traces on the wheel rim and chassis → the main sealing ring is damaged

Brake drag/unilateral heating: weak driving, tire overheating → aging of sealing ring, piston not returning to its original position

Abnormal noise, differential return: broken dust cover, rusted guide pin

Rubber aging: cracking, sticking, hardening, loss of elasticity → replace immediately

5、 Key installation points

Cleaning: Clean the cylinder body/piston with alcohol/brake fluid, and do not use gasoline or kerosene (which may damage the rubber)

Lubrication: Apply a thin layer of silicon-based brake grease during assembly, and do not use butter

Complete replacement: Replace the sealing ring, dust cover, and guide pin sleeve together to avoid rework

Exhaust: After replacement, thoroughly exhaust the air, test the braking force, return position, and whether there is dragging brake