rear caliper overhaul

[Vern Klukas]

I'm thinking the silica gel may be a worry down the road. The paper slip that you don't get anymore is anticorrosive paper. You can buy the material elsewhere, by the way. Anyway, it works by emitting a vapour that settles on the parts to keep the rust away.

My concern about the silica is you have no way of renewing it if it gets saturated, or even knowing if it does get saturated. Once the gel is saturated with water you tend to get a humid atmosphere even without the introduction of more water vapour.

Do I think it's enough of a worry to rip the calipers out? No, this is a long term issue if it's an issue at all. But no fording 2 foot deep creeks, OK?

Yours
Vern

 

[mikecoombs]

I thought i'd add a note here on reassembling the pads etc when not actually replacing them. After much careful analysis I've determined that when removing and replacing the outer pad for access reasons (like taking the disc off to get to the brake pipe) they slide out to the rear and go back in from the rear. They wear slightly more at the rear and wedge in so you can't get them in from the front without backing off the other pad first which is a pain to do in situ.

 

[ButterFingers]

Ah, so you remember then. I was beginning to think I dreamt it.......

You summer weight anorak does you proud sir, give it time, polar explorer type awaits you....

for the Aussies and kiwis, in here, an "anorak" is a "PARKA" , rather like a bonnet is a hood and a boot is a trunk......ahh the delight of the english language..
Peter

 

[cobraboy]

I am working on a set of rear calipers to have as a swop in spare set as I know one of mine on the car has a pitted hydraulic bore and will probably leak soon.
I struggled to get the hydraulic pistons out as they were stuck and 150 psi of air would not move them, I did not have any way to plumb them into a car hydraulic system to pump them out so turned to the old faithful ................ grease gun !
I tapped a 1/4" UNF thread in the end of a male 3/8 " UNF brake line nut and screwed in a grease nipple, then fitted the nipple to the caliper and in a couple of pumps the piston rose out of the bore in a nice controlled fashion. Works on front calipers as well but you have to block / wedge the pistons that you are not wishing to remove to allow the stuck one to get forced out.

 

[mrtask]

 

[ButterFingers]

the power of a nipple is never to be underestameted....

 

[cobraboy]

Oooh I say steady on.
OK so thanks to Harvey who kindly sold me some used cups I am now playing at re furbing those.
I found that it is possible to remove the centres by threading in a bolt then clamping the head of the bolt in a vice and by grasping the cup and turning clockwise whilst pulling hard the centre will eventually pull out. It is held in by a spring clip, to get back in you compress the clip, align the little tag with the slot in the centre section then feed in by hand and then push to the bottom of the cup with a scriber.
The outer cups cleaned up really nice on a belt sander and are going off for re chroming on Tuesday.

 

[quattro]

I tapped a 1/4" UNF thread in the end of a male 3/8 " UNF brake line nut and screwed in a grease nipple, then fitted the nipple to the caliper and in a couple of pumps the piston rose out of the bore in a nice controlled fashion. Works on front calipers as well but you have to block / wedge the pistons that you are not wishing to remove to allow the stuck one to get forced out.

I was helping Ian Wilson put his car back on the road and we had this problem; the piston refused to move. I got the grease gun and undid the tip of the gun where it fitted over the nipple until the little jaws inside opened enough to fit over the end of the P6 bleed nipple, then tightened it up again. Used the bleed nipple of the other caliper in the other hole to seal it off, then was able to apply the full pressure of the grease gun to move the piston.

Richard

 

[cobraboy]

I was helping Ian Wilson put his car back on the road and we had this problem; the piston refused to move. I got the grease gun and undid the tip of the gun where it fitted over the nipple until the little jaws inside opened enough to fit over the end of the P6 bleed nipple, then tightened it up again. Used the bleed nipple of the other caliper in the other hole to seal it off, then was able to apply the full pressure of the grease gun to move the piston.

Richard

That has to be worth remembering

 

[falkor]

what a thread! colossal! so where do you GET rear calipers from? this a problem that my Rover V8 has been facing and for the last 3 weeks it has been languishing in a yard awaiting the old knackered calipers being machined and reupholstered, I'll save you the agonising story, but in the end I decided to email our favourite three P6 parts suppliers (that my Garage seemingly were oblivious to) to see what they had to say on the subject:

Dear Sir,
Calipers are £250 + VAT on exchange, we require old units first. Regards

J R Wadhams Ltd
The Brads Nail Works

Thanks for inquiry
Reconditioned Professionally - £120.00 each + vat (Exchange)
In stock
Geoff Unwin
Wins International Ltd
Unit 21B, Durkins Road

Hi , Rear Calipers are £110 each exchange plus shipping.

If your are on the UK mainland we Will send refurbed calipers out with a deposit of £80 per caliper, which is refunded when the old calipers arrive back with us.

If you are not on UK mainland, then you will need to send your old calipers to us before we send refurbished calipers out.

Cheers, MARK, MGBD PARTS , UNIT 1 ASHFORD INDUSTRIAL ESTATE

added to the thread for info, have you replaced your rear brake calipers lately?

 

[chrisw]

added to the thread for info, have you replaced your rear brake calipers lately?

My recommendation would be Geoff at Wins for fantastic service.

 

[TreeVee]

The radical solution is to replace the driving brake function with standard double piston calipers (in my case from Saab 99/900) and keep the original calipers as parking brake only.

My diff carrier was rather rusty and had been repaired previously which was fixed by replacing it with a bespoke carrier.