Rear calliper leaking?

peters3103 · Post by **peters3103** » Tue Jul 29, 2014 10:42 am

Hi all,
Well after several months of refurbishment my 61 fhc rear suspension has been reunited with the car. I removed it to have the differential rebuilt as it was noisy and had started to weep from the LH driveshaft seal. I took the opportunity to replace wheel bearings, radius arm bushes and replace seals and boots in the brake callipers. Also sandblasted and repainted everything and fitted GAZ height adjustable shocks and new springs. Had my first drive today and all was well until I noticed brake fluid dripping from the left rear. I've not yet jacked it up and had a close inspection but fear the calliper is leaking which means removing the whole IRS again. BLAH! Oh well at least it's nice and clean to work on and the nuts and bolts are new.

christopher storey · Post by **christopher storey** » Tue Jul 29, 2014 10:57 am

Don't despair yet ! It may just be that you have not done up the unions sufficiently tightly, and these can be tightened without removing the suspension. I tested mine before I put it in the car, with compressed air and soapy water on the unions, and I was surprised just how tight they had to be done up to stop bubbles appearing even with as little as 20 psi

peters3103 · Post by **peters3103** » Tue Jul 29, 2014 11:08 am

Thanks for the encouragement. I'll certainly be checking everything thoroughly before pulling the IRS out again.

Cheers Pete.

peters3103 · Post by **peters3103** » Wed Jul 30, 2014 10:53 am

I've checked all the unions are tight and cleaned the brake fluid away. Looks to be leaking from the outside piston on the left calliper. (Not the brake pipe union). If I'm not mistaken it seems that piston can be removed with the calliper in situ. You get good access to the four bolts once the front rear shock absorber is removed. Does this sound right? Not sure why it's leaking as the callipers had new rubbers fitted.

christopher storey · Post by **christopher storey** » Wed Jul 30, 2014 12:43 pm

Yes, you should be able to undo the four small fasteners and take cylinder and piston out . As for leakage, I'm afraid it's not uncommon for the seal to be trapped/kinked/turned over as the piston is inserted into the cylinder, and if this happens leakage is almost always the result. When you remove the piston you should be able to see if the seal is damaged in any way . If it is undamaged , use plenty of lubricant - preferably red rubber grease - and with the seal correctly positioned reinsert the piston dead squarely into the caliper. It is best to use gentle sustained pressure e.g. from a drill press to do this rather than a succession of light taps

peters3103 · Post by **peters3103** » Wed Jul 30, 2014 8:31 pm

Thanks Christopher, will see how it goes.

peters3103 · Post by **peters3103** » Sat Aug 02, 2014 10:20 pm

Ok, outside calliper cylinder/piston easily removed and dismantled to reveal the seal having been damaged during assembly. A 10 centimetre piece sliced off the edge. I have a new seal which I will install today once we get up a little from -6 degrees.

peters3103 · Post by **peters3103** » Sun Aug 03, 2014 4:35 am

Apologies that should read 10 millimetres not centimetres

peters3103 · Post by **peters3103** » Tue Aug 05, 2014 7:35 am

Calliper piston now with another new seal fitted and re-installed on car. Bled the brakes and all is dry! Glad I fitted remote bleeders - makes for a much easier job.

Pete

christopher storey · Post by **christopher storey** » Tue Aug 05, 2014 8:45 am

Excellent, Pete. Good luck with it all

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