Classic cars forum & vehicle restoration.

[shell27]

I have a 1938 Sunbeam Talbot 4 litre and just recently the front brake come on gentley until they are on solid, once they are on solid I can let a small amount of fluid out of the bleed nipple and then everything is fine for another 2 or 3 miles, can anyone help with this prob

[Rick]

hi shell27, welcome to the forum. I've heard of internally collapsed front flexi pipes causing brakes to be slow to release, but I'm not sure if it'd have this effect too?

Rick
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[47p2]

If the fluid hasn't been changed for a number of years it might have water in it. This would cause it to heat up and expand quickly when driving along
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[pigtin]

Just had the same problem with my special after fitting a modified master cylinder. I had not left any slack in the linkage from the pedal, and a weak spring was allowing the pedal to move slightly, pumping up the system over a few miles. May be worth a check, make sure the plunger is not held in by the slightest amount and there is free pedal movement before it connects.

[Kaybee]

...and if it's not pedal clearance as Pigtin said, then you better have the master cylinder rebuilt....blocked compensating port or swelled rubbers I'd suggest, cheers, Col.
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[shell27]

[pigtin]

Just had a look in the books and it would appear that if anything stops the master cylinder piston from returning to it's fully expanded position it blocks the bypass aperture. That was the problem on mine.

Don.

[shell27]

Thanks for the help people, it looks if it has been solved by changing the fluid which I have done today and I have took it for a test drive and so far so good. Shell27