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stuck brakes...

FM Former Member
the front brakes on my tub are sticking. i have done the disc brake conversion and lately they get stuck and heat up the rotors after about 5 minutes of driving. i have put new pins, bled the brakes over, cleaned off where the pads sit in the calipers, and have sanded the brake pads with fine grit paper in case of any contamination. i have also lightly sanded the rotors with fine grit paper as well to break any glazing if any has formed...any suggestions? thanks felas!

julio
85 rx-7 gsl-se
57 cmc-c speedster
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FM Former Member
the front brakes on my tub are sticking. i have done the disc brake conversion and lately they get stuck and heat up the rotors after about 5 minutes of driving. i have put new pins, bled the brakes over, cleaned off where the pads sit in the calipers, and have sanded the brake pads with fine grit paper in case of any contamination. i have also lightly sanded the rotors with fine grit paper as well to break any glazing if any has formed...any suggestions? thanks felas!

julio
85 rx-7 gsl-se
57 cmc-c speedster
FM Former Member
before they get to the sticking point, are the pads floating under light tension in the calipers or are they binding? Is the master cylinder alowing the pressure to release? WHen clamped tight if you open the valve on the caliper does it release pressure on the disc?
add: are the rotors centered in the calipers? some kits have different spacers (washers of varying thicknesses) which alow the caliper to be adjusted over the disc.

(Message Edited 10/16/2002 11:09:40 PM)
FM Former Member
i'll give it a shot doing these things and see what happens. the brakes have no sticking problems until they get warmed up. it gets to the point of the brakes having the burnt smell to them. this is when i stop driving and let them cool off a bit. the calipers are centered on the rotors now, and it still happens. any other tips are veryhelpful. in the meantime i'll get going on these!! thanks again
FM Former Member
Next try to roll the car after pumping the brakes and if it does not roll as eassily as when you released the pressure in the calipers you aree closer to the solution. Does the pedal ger harder as you pump it?
Pressure is building and not being reeleased by the master. All the newer master cylinders are designed for disc brakes but early German masters had a residule valve in them for drums. You may have to replace the master.
FM Former Member
Sorry Julio the first part of my post accidentally got erased.
Bleed off the pressure from the brakes and try rolling the car. It should roll freely, next pump the brakes 20 to 30 times hard, simulating a hard drive. Now try to roll the car, if the brakes are locked, check the brake pedal travel and see if it is free (about 3/4 inch travel before the rod hits the master piston)then release the brake fluid pressure on one side and see if that frees the wheels.
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