Thread: Front Brake problem?????? 1956 Buick Special

Tweet

I have fire wall mounted dual 7" booster with dual master cylinder 1" bore
can be used for disc disc or disc drum. I have a disc drum proportioning valve My problem is very low pedal when everything is cold as brakes and engine heat up pedal comes up and front brakes drag. I have disc front and drum rear I believe I have enough pedal free play. I also have hotrod hanging universal pedal assembly.

Sounds like you still have some air in the lines. I always start bleeding the lines from the wheel cylinder closest to the master cylinder and work my way back to the furthest from the M/C. Be absolutely sure you have no more air coming from one cylinder before you move to the next. Others more expert in this field please chime in.

Jack.

I have bled brakes severial time. I don't think it's the problem but I wil;l do it again. I just purchased a pressure bleeder this may help. Thanks for the ifo I will let you no what happens.

Sledhead,
Don't be afraid to waste some brake fluid to be sure all the air is out. Good luck.

Jack.

Are you using residual check valves on the disk brakes? Also, is any part of the brake system close enough to the exhaust that it might be heating up?

my screw up

my 2nd screw up

I am using a disc drum proportioning valve, also using DOT3 brake fluid . My brake lines from the master are 5 1/2" away from exhaust. I have read that DOT 5.1 will raise boiling point much higher than DOT 3, and is not silicone.