72 E Body Sticking Brakes

xbrit · Post by **xbrit** » Sun Apr 07, 13 11:13 pm

I have had this problem since I did my restoration but it does seems to be getting better. As I am returning to the UK soon I would like to sort it out while still over in the states.
Some times if I apply the brakes (factory power disk) they stick on and after about 15 to 20 seconds they release and free up.
Now the obvious thing would be the front calibers, but they are brand new. I had the same issue before replacing them. On my restoration I put in new proportional valve, new master cylinder new rear slave cylinders and as mentioned new calipers. The only thing I didn't replace was the brake booster.
Any input, could it be a faulty prop. valve or the only part I didn't replace the brake booster?
Cheers,

Dave-R · Post by **Dave-R** » Mon Apr 08, 13 8:36 am

Residual pressure valve in the master cylinder outlet?

latil · Post by **latil** » Mon Apr 08, 13 9:04 am

Pushrod adjustment? Internally collapsed flexi pipe?

Adrian Worman · Post by **Adrian Worman** » Mon Apr 08, 13 9:29 am

Both those things, even on a new M/C, collapsed/twisted flexible rubber lines too, Daveman and Steve get first Brownie points

xbrit · Post by **xbrit** » Tue Apr 09, 13 1:41 am

Thank you gents,
Where is the ”Residual pressure valve in the master cylinder outlet" is that internal to the master cylinder, any adjustment or replace?
Also the same for the ”Pushrod adjustment? Internally collapsed flexi pipe" where is that?
Please excuse my ignorance.

Dave-R · Post by **Dave-R** » Tue Apr 09, 13 8:35 am

The problem is you are not clear as to which wheels are locking on.

Is it all four wheels? This would be unlikely in a dual circuit system. There is no adjustment on the brake pushrod that I am aware of. Not as standard anyway.

If the master cylinder was intended to be used on drum brake cars then there could be a little valve in the front brake outlet of the master cylinder where the brake pipe screws into the master cylinder. This could hold the front brakes on.
You just need unscrew the pipe and remove the valve from the cylinder outlet.

The flexy hose is the flexable part of the brake line that attaches to the brake calipers at the front and to the axle at the rear.

They can collapse internally and cause problems. But it would be unlikely if both sides went at the same time on the front. But as there is only one at the rear it could effect both wheels at the rear.

Hope that is more clear. It is hard to judge how mechanically minded or experienced any new person is.

xbrit · Post by **xbrit** » Wed Apr 10, 13 8:56 pm

I am sure it is only the front wheels. The factory braking system was retained, but all replaced with OMS (Original Manufactured Spec.) parts. As I said the more I drive it the better it seems. I think I will leave well alone until back in the UK, if it had been a brake booster then it would make sense to replace here in the US.
Cheers,
Mike