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Brakes on 1974 E12
Posted: Sat May 13, 2017 12:55 pm
by Domingo
After changing the rear brake pads the car run great for the first 30 minutes then the pedal becomes mushy and doesn't block the brakes, feels dangerous.
Any suggestion pls?
Posted: Sat May 13, 2017 8:30 pm
by RonDwyer
Did you change the fluid and bleed the brakes properly? Master cylinders can also fail. Pads do not cause loss of pedal firmness unless they are made of foam.
Posted: Sun May 14, 2017 12:06 pm
by Domingo
Agree, problem appeared after brake disks were aligned.And brake pad for the rear changed.
Bleeding was done properly.
Something the mechanic did wrong? Yes Masters can fail but why would it work the first 30 minutes?
How would I check the Master otherwise?
Posted: Mon May 15, 2017 9:08 pm
by RonDwyer
Process of elimination.
Check all 4 corners for leaks
Check hoses
Trace lines
How old is master?
Re-bleed brakes with power bleeder, start farthest from master first.
No luck? Replace master cylinder.
Posted: Thu Jun 01, 2017 11:53 pm
by bizz
LHD or RHD? I replaced the check valve between the manifold/boosters on my RHD E12 and it helped enormously.
Posted: Sat Jun 03, 2017 1:46 pm
by Domingo
Problem solved:
It was dust on one of the caliper's piston after taking the brake disk for alignment.
Rear right tire: Left hand Drive car.
Seals ok.
Car brakes fine
Thanks for all the support.