Quote:
Originally Posted by Frank Lee
Also internal failure of rubber brake line has been said to happen where it may look OK from the outside but inside a loose flap of rubber closes off the flow (I've not seen this myself though).
|
Seen the brake hose "check valve" syndrome back in the 1980s on Mercedes in particular.
Best test was hit the bleeder and release the residual pressure, then reapply the brakes and see it lock up again.
Eventually I got to the point where I would clamp off all four hoses. This allowed the master cylinder to be tested, then each wheel individually by releasing the clamps in sequence. Helped a lot to quickly diagnose the frozen floating caliper pins.
One time a friend brought his old tired 280 Z in the shop with a brake pull. The left caliper was practically frozen. Not paying attention I put my hand on the rotor and had "min dia 10.5 MM" branded on the callouses at the point where the fingers meet the hand. The callouses were so thick it took too long to feel the burn. Never blistered.
regards
Mech