sticking front brake?

Hi Rich,

The big coil spring that sits between the control valve lid and the diaphragm is a modification spring. It was never part of the original Lockheed design but problems with brakes sticking on later showed this to be a design fault, so to compensate a modification spring was added.

A new control valve sounds like the way to go, everything is included save for the modification spring which you must transfer.

Ron.
 
When I rebuilt my servo, the air piston had a small rubber seal on it, which was in the servo rebuild kit. The whole thing was fairly mucky to start with, so a good clean out and a new seal was fitted.

You may find that a new seal will be all that is needed

Richard
 
I think the internal bits are mostly OK. The 2 bits that are gone are the spring and possibly the little rubber which sits in the very top of the white valve casing...

Not sure about that modification spring, but from what ron has said you'd only expect it to apply fairly light pressure...?

Rich
 
Kit ordered from rover classics!

Will update with the results tomorrow evening hopefully!

Rich.
 
Drove car to post office... got seal kit, fitted in 5 minutes and fixed eureka!

:)

Thanks all for your help as always!

Rich
 
Was definitely the little spring in the top comparing new to old as the force with which the piston returned was much greater! And PAE's brakes have never felt so good....

rich
 
rockdemon said:
Was definitely the little spring in the top comparing new to old as the force with which the piston returned was much greater! And PAE's brakes have never felt so good....

rich
Click to expand...

Well done Rich, I need to have a chat with you about this on Sunday then, mine feel a bit wooden at the mo.
 
Sure... Of course its now developed a tick but I think I just need to chack the disks and pads now....

Rich
 
Just bent the brake guards back on the drivers side as it looked a bit close and seems OK now!

Hooray simple result :)
 
Hmmmm, might try that.
I rebuild the nearside swivel pillar with new ball joint, discs, calipers and brake parts a few months ago, but since then have had a faint tick-ticking noise at low speeds after a fast run. Not sure what it is, but it disappears when you touch the pedal. Rich, do you have those anti-rattle springs fitted to your calipers? Mine were missing so I made some out of copper wire. Maybe they don't work properly....

Michael
 
Everything looks present on that front.... And the braking does seem good at the moment.... :)

Rich
 
interesting thread. I had front brakes stick on couple of years ago so got exchange servo unit as I found by undoing brake pipe line the pressure fell off and I could drive home.
annoyingly having covered just a few hundred miles since ( and about 2 years) exactly same occurred. though no tools as was in for MOT ( passed)
so as was automatic and just few miles form home I drove it back . not a clever idea. didn't see. smoke from wheels until I stopped on drive! also. saw. coolant was. being lost in a long trail up road..damn though it was still in green ( just) so more issues ( wife wants me to get rid of money pit now)
so .do I replace servo yet again? gets expensive at 300 odd miles between Servos. just reading about 'air valve'. is that the white assy fitted to the unit? if so are these exchangeable ? or do you simply buy new? any advise welcome apart from using a flamethrower ( wife has offered)
 
Hi, Yes It's usually the air valve that makes the servo drag or stick, they are available on ebay for less the £20. There's a thread on one of the lotus forums (I think) about the position of it affecting it's operation.

Colin
 
thanks Harvey. I thought that too so perplexed why its only front brakes..when I undid hydraulic pipe from servo to brake lines they released so was able to move off drive . wondering if something is obviously 'sticking' in braking circuit but as not a trained car mechanic ( decent DIY though ) not fully familiar with the braking circuit/servo/air valve situation.
odd situation . nobody else ever had this ?
 
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