Author Topic: Guide to brake caliper overhaul wanted  (Read 6921 times)

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Offline Gobbles

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Guide to brake caliper overhaul wanted
« on: December 04, 2009, 14:00:45 PM »
My calipers are sticking and I'd like some info on how to get them running smoothly again

Thanks  :)

Bovva

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Re: Guide to brake caliper overhaul wanted
« Reply #1 on: December 04, 2009, 14:36:27 PM »
Taken from another forum,

""The cast iron caliper body's are pretty robust items, so are generally alright, apart from being covered in dirt and the odd bit of surface rust, (which can easily be cleaned off), check for any cracks or damaged to the body of the caliper, especially if you got them from a scrap yard as the chances are the car they were taken from, was involved in a heavy accident which could have caused damage to them.

What you really want to do is check the condition of the actual piston within the caliper, don't worry about the inside of it, as these always go rusty, but carefully inspect the outside of the piston, as this is the part that the caliper's fluid seal bear's against. Any inperfection in this surface could cause fluid leaks and loss of breaking, which is NOT good.

Also check the condition of the rubber fluid seal and the rubber dust seal. Give them a gental stretch, (not too much as you dont want to damage them), but just enough so you can inspect them for cracks. The rubber should be soft and flexable, however if its not and there are tiny cracks in the surface of the seals this means the rubber is old and should be replaced.

I'd also check the condition of the rubber boots that go over the sliders, again these shouldn't have any cracks and should be soft and flexable. While your their check the slider rods and the holes they go into, they should be clean shiney metal and rust free. Also try and get all of the old grease out from the hole and replace it with new as this will help the caliper slide more easily.

Oh and I'd also replace the bleed nipples for new items, they're only coppers to buy anyway, so their's no real reason not to replace them. It also makes bleeding the brakes a hole lot easiler when you come to fit the calipers onto the car"



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Offline Trigger

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Re: Guide to brake caliper overhaul wanted
« Reply #2 on: December 04, 2009, 15:23:40 PM »
Gobbles with your experience tbh I would take up the offer and see if you can dive up to Towcester for some assistance. To see it done first hand and help in the process you'll learn shedloads

Offer in this thread post #3. He's a top man  http://www.clubcalibra.com/index.php?topic=31633.msg405715#msg405715

Offline Gobbles

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Re: Guide to brake caliper overhaul wanted
« Reply #3 on: December 04, 2009, 16:43:26 PM »
Thanks guys. Appreciate it. Unfotunately I can't drive to Towcester due to the MOT being out

In Shifty's post it says to replace the grease with new. Is copper grease the best choice?

Offline Phil.

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Re: Guide to brake caliper overhaul wanted
« Reply #4 on: December 04, 2009, 19:10:59 PM »
Thanks guys. Appreciate it. Unfotunately I can't drive to Towcester due to the MOT being out

In Shifty's post it says to replace the grease with new. Is copper grease the best choice?

Multi-Purpose grease on the slider bolts and copper grease on the back of the brake pads :)
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Offline mrControversial

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Re: Guide to brake caliper overhaul wanted
« Reply #5 on: December 04, 2009, 23:39:50 PM »
Never done it myself but I think, before attacking this, you really need to find out what tools you are going to need for removing and dismantling the caliper and advise on if anything's likely to go "pop".

Obviously you are going to need to bleed the brake system? You'll definitely need some thing to stop the fluid escaping once the pipes are removed.
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Offline carl

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Re: Guide to brake caliper overhaul wanted
« Reply #6 on: December 05, 2009, 09:51:35 AM »
sand them down


prime them up


paint them



:D :D :D good luck....hope this helps
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Bovva

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Re: Guide to brake caliper overhaul wanted
« Reply #7 on: December 05, 2009, 10:48:01 AM »
Carl he wants to mechanically overhaul them mate, not cosmetically.