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 Posted: Sun May 05, 2013 4:22 am |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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Hya,
Today I'm going to dismantle and give pistons a good [copper] greasing / generic clean of brake components.
All because I hear driver-side front brakes squeak (when brake pedal is -not- pressed) at low speeds only and during high temperatures (warmer day/longer journey)
Would you have any other tips where to look into, or tests to run before I undo all the caliper nuts?
Cheers fellows!
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Posted: Sun May 05, 2013 5:41 am |
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Joined: Feb 19, 2013
Posts: 207
Trade Rating: +5
Location: stirling
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give the brake pad shims a good cleaning as well, these can gunk up over time and cause the brake pads to bind to the brake disc. 
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Posted: Sun May 05, 2013 5:43 am |
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Joined: Feb 24, 2012
Posts: 54
Trade Rating: 0
Location: Leeds
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Make sure the caliper sliders are fully lubricated, this sorted squeaky brakes on both mine and my dads brakes.
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Posted: Sun May 05, 2013 3:42 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Do not use copper grease on anything touching the seals or rubber dust covers. Over time this will perish them so use red rubber grease for that. Copper grease is great for all the metal-to-metal contact surfaces but not recommended for the rubbers.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Tue May 07, 2013 7:31 am |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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Thank you all!
Sadly the squeak is still there.
Last Sunday I carefully smeared (deposited a ~1mm layer) on the back of the outer brake pad, where metal-metal contact gets in, with CV Joint Grease (Moly-Lithium), also around the ears of the brake pads.
I also smeared the outer part of the piston, which presses the inner brake pad.
The brake pads were changed July 2012, they are still thick enough: Mintex MDB2012 (BPS2619) - they have no shims.
Sadly the squeak is still there. I read that smearing grease on shimless pads where caliper presses would reduce squeak. But logically I cannot explain that - how can grease work as an adhesive?
I probably need to get some shims and put them on.
Cheers,
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Posted: Tue May 07, 2013 7:33 am |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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Caliper sliders were lubricated back in July 2012 using copper grease, and there is still enough of that inside. No visible damage to rubber seals or covers.
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Posted: Thu Jul 18, 2013 5:29 am |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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Hello again,
Before yesterday I smeared all metal-to-metal touchpoints with copper grease, gave a generous layer for the outer caliper blades, but squeaking still persists..
Is it worth trying this out:
www.ebay.co.uk/itm/MIN...2313c913f1
?
Here's how looks now:
Cheers,
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Posted: Fri Jul 19, 2013 4:50 am |
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Joined: Jul 17, 2013
Posts: 26
Trade Rating: 0
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Could it be the inner edge of your disc has a lip that is rubbing on your pad or caliper looking at the picture
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Posted: Sun Jul 21, 2013 1:54 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Pads will wear to the shape of the lipping so that alone shouldn't be causing the squeal.
It looks like you have done a good job so you are on a difficult one here.
Do you frequently drive on dusty (gravel) roads. If you do squealing can be impossible to eliminate.
Do your pistons move freely in the callipers? It could be corrosion on the pistons making them stiff in the callipers. Strip the calliper and lift the dust seal on the piston and see how much corrosion or crud is on the piston.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Sun Jul 21, 2013 3:51 pm |
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Joined: Jun 22, 2013
Posts: 90
Trade Rating: 0
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I have the same problem paid someone to get the job done getting all the parts cleaned lubricated but when its warm the skeaking still persists
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Posted: Sun Jul 21, 2013 3:59 pm |
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Joined: Apr 05, 2013
Posts: 79
Trade Rating: 0
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If that was mine you would be able to see a good covering of copper grease all over the back of the pad, cant see any on yours in the pic ? try taking the pads out and give the backs a good covering of copper grease to ensure any contact point meets with copper grease.
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Posted: Mon Jul 22, 2013 4:11 am |
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Joined: Jul 17, 2013
Posts: 26
Trade Rating: 0
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Some Mintex pads come with anti-squeal shims some don't the ones i have just fitted has the shims so i didn't copper grease,so just waiting for the squealing.
It also could be the hub bearing test with a squirt of lubricant.
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