When the vehicle is in motion, it can not brake immediately after stepping on the brake pedal. The braking effect is weak. The car continues to slide and check the road

Surface, no drag, embossing marks on the tire. There are several reasons for this:

(1) brake shoe friction plate used for a long time, serious wear, or mountain driving, brake frequent use, friction produces high temperature, so that friction

The surface layer of the sheet is aged by ablation and is not repaired or replaced in time.

(2) the brake shoe friction plate in the riveting process, the quality is poor, the rivet loose shaking; Improper or not timely adjustment of brake clearance;

Brake drum into the sand or rivet fall off, causing the drum, plate surface grooving, poor contact, brake performance is reduced.

(3) the brake shoe underwriting sleeve hole grinding, making the shoe sink, gap adjustment is difficult; Or brake shoe supports the adjustment CAM in

The rust in the sleeve is stuck, which hinders the adjustment of brake clearance and reduces the braking effect.

④ Brake drum bearing nut adjustment is too loose or too tight. When the vehicle is too loose, the friction plate is in bad contact with the brake drum.

When the bearing is too tight, the lubricating oil becomes thin and drips to the friction plate, causing skid and brake weakness.

The air compressor is not working well, so that the air pressure in the air storage cylinder is insufficient, the brake pipeline leaks, the brake valve and other places are not tightly sealed and leak; points

Pump skin bowl damaged; Air compressor series oil, so that a large amount of oil, not into the brake pipeline, causing brake weakness.

The brake pedal free travel is too large; The gap between the brake drum and the piece is not adjusted properly, and the brake drum is out of round; Worm adjustment on brake arm

Improper, the push rod of the brake pump extends too much, the balance spring of the compound brake valve blocks the hairpin, and the motion interference of the internal and external balance spring occurs when braking.