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Topic: Rear Brake Disc/Pad Replacement (Read 358 times) |
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DB
Newbie
I love YaBB 1G - SP1!
Posts: 17
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Rear Brake Disc/Pad Replacement
« on: Sep 23rd, 2006, 2:13pm » |
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I am replacing the rear discs and pads on a P reg. 2.3 Ultima but find that the new pad thickness of approximately 8mm will not provide sufficient space for the new disc. The piston is wound back so the inner pad does not interfere with the disc but the outer pad would need to have no more than 5mm thickness of pad meterial to allow the disc into the caliper. With the piston fully in the inner pad does not influence the available gap. The critical dimension for the disc is determined by the jaw of the caliper, which is no-adjustable, and the outer pad. I checked pads from two different manufactureres and they both have approx 8mm of pad thickness?
I am puzzled as, even if they were available it would not seem sensible to replace worn pads with new pads with a thickness of only 4 or 5mm. The discs ordered over the web appear to be the right thickness.
I have done discs and pads before on this and other cars so feel a bit stupid. The only solution would appear to be a slightly thinner disc and/or pads but I would be surprised if the suppliers have not provided the correct replacments
Any ideas out there.
Many Thanks
David
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malcolm
Junior Member
1998 2.3 ULTIMA ESTATE
Posts: 55
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Re: Rear Brake Disc/Pad Replacement
« Reply #1 on: Sep 23rd, 2006, 2:53pm » |
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Hi david is your caliper sliding on the two pins that hold it in as these sometimes seize up your caliper should move back so the front pad is tight to the disc which will increase the space for the back pad hope this helps malcolm
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DB
Newbie
I love YaBB 1G - SP1!
Posts: 17
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Re: Rear Brake Disc/Pad Replacement
« Reply #2 on: Sep 23rd, 2006, 5:16pm » |
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Malcolm,
Absolutely right. One pin is seized on each side. I have freed one side and fitted the pads satisfactorily but the other side will not move even with some assistance from a mallet and a large wrench. Must be careful not to shear it so will soak in Wd40 overnight and revisit tomorrow. Many thanks for the advice. It seems obvious now but I did not spot it. and wasted lots of effort
Thanks for your time
David
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solarpanel
Full Member
I love YaBB 1G - SP1!
Posts: 551
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Re: Rear Brake Disc/Pad Replacement
« Reply #3 on: Sep 23rd, 2006, 5:16pm » |
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hi have you lined up the cut outs in the caliper piston so the pads fit in
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DB
Newbie
I love YaBB 1G - SP1!
Posts: 17
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Re: Rear Brake Disc/Pad Replacement
« Reply #4 on: Sep 23rd, 2006, 5:34pm » |
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Cut outs OK. See my 17:16 reply above. (Your response crossed mine 34 seconds later)
Thanks for you help
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Matt
Senior Member
Manual 24v
Posts: 2816
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Re: Rear Brake Disc/Pad Replacement
« Reply #5 on: Sep 23rd, 2006, 5:47pm » |
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hi,
on the rear cylinders, the notched part rotates (self adjustment system) you may need to wind it in by turning it clockwise, being careful not to damage the rubber oil gatier
matt 
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FDS2000 Scans - Birmingham
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DB
Newbie
I love YaBB 1G - SP1!
Posts: 17
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Re: Rear Brake Disc/Pad Replacement
« Reply #6 on: Sep 24th, 2006, 12:11pm » |
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All sorted. Issue was the corroded pins highlighted by Malcolm. I had to soak one overnight in WD40 and use a spanner with a 2 foot extension to release it gradually-definately a case of not too much torque or it would have sheared but it took an hour of coaxing to release it.
All brakes now in good order just need to revisit next weekend to fine tune the handbrake. I have read the procedure via the postings so am prepared for some equalising of the cable etc.
Then in for an MOT
Many thanks for all the advice
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malcolm
Junior Member
1998 2.3 ULTIMA ESTATE
Posts: 55
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Re: Rear Brake Disc/Pad Replacement
« Reply #7 on: Sep 24th, 2006, 12:16pm » |
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Glad to here you are all sorted, best of luck for the m.o.t. malcolm
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