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        General >> Problems >> front brake pad clunks when hot
        
(Message started by: pedropedro on Apr 9^th, 2011, 3:52pm)

Title: front brake pad clunks when hot
Post by pedropedro on Apr 9^th, 2011, 3:52pm

ive had the caliper carrier changed..... ive had the pads changed

its movement of the pad and no one caan seem to stop it on just x1 pad ...i did put some adhesive metal foil layered around the metal that butts against it and that stopped it for a few months but came off of course

any ideas ?? john

Title: Re: front brake pad clunks when hot
Post by lleewar on Apr 10^th, 2011, 2:51pm

Could you fit some shims on the brakes??

Title: Re: front brake pad clunks when hot
Post by pedropedro on Apr 10^th, 2011, 3:07pm

I could i guess ...just not sure where to begin ...just wondered if anyone else had experienced and had come up with a fix

Title: Re: front brake pad clunks when hot
Post by Mike H on Apr 10^th, 2011, 6:01pm

Find a bigger pad?

Title: Re: front brake pad clunks when hot
Post by Jonnycab on Apr 15^th, 2011, 3:29am

At last !!!...someone else who is suffering the unexplained front brake pad clunk ;)

I posted the same thing over a year ago HERE (http://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl?board=Problems;action=display;num=1263693629;start=14#14)

I still haven't sorted the problem (20K miles later ::)), although I'm pretty sure it's down to the age/wear in the calipers. The brakes still work fine & always pass the MOT & council taxi inspections...it's just that they moan in reverse & then clonk when applied...then clonk again when applied going forward ::)

Title: Re: front brake pad clunks when hot
Post by pedropedro on Apr 15^th, 2011, 6:49am

So I am not the only one... fitted new carrier greased etc but comes back after 5 miles driving when disc/pads hot

will try the mintex pads as you said..tks for info....pad needs a clip on the end to fill the gap...couldnt be that hard to make a 3 sided spring stainless clip....??? but in practise it is..ive tried stayed on for 2-3 weeks etc ..!!

is the mintex code MBD 1620 ? just double checking

Title: Re: front brake pad clunks when hot
Post by Jonnycab on Apr 15^th, 2011, 12:06pm

The Mintex pads only solved the problem for a while, but good luck anyway. Personally, I'm going to try a new pair of calipers :)

Title: Re: front brake pad clunks when hot
Post by pedropedro on Apr 15^th, 2011, 2:16pm

could you pm outcome ?

Title: Re: front brake pad clunks when hot
Post by Jonnycab on Jun 16^th, 2011, 3:28am

John, I finally got around to replacing the front calipers with good second hand ones (£20 each) at the weekend (but kept the original pad carriers in place) & am happy to report that the problem seems to be resolved.....no more clunking or moaning :D

The old calipers' piston outer seals were badly stretched & wrinkled...the N/S one had completely come away from the piston & was touching the pad ::)

Although I haven't stripped down the old calipers yet, I'm thinking that so much water & grit had got through the seals, that the pistons & bores are most likely corroded & badly scored. The pistons were probably sticking slightly (moaning noise), & also moving laterally (a fraction of a millimetre) when pushing the outer pad against the disc, causing the pad to 'clunk' against the pad carrier :-/
....Just a theory mind you....won't know until I strip the old calipers down :)

Anyway mate, just thought I'd let you know ;)

P.S....now the rear brakes are starting to click very slightly when braking in reverse. I'd lay money on the fact that after nearly 236,000 miles, the rear calipers are starting to go exactly the same way as the fronts did ::)

Title: Re: front brake pad clunks when hot
Post by pedropedro on Jun 16^th, 2011, 7:10am

Hello Jonny

thanks for rembering to keep me updated...I had come to the conclusion it was the caliper..Ive had the carrier changed and it helped a bit......its still there(the clunk) but less so; maybe will get around to changing the complete caliper some time..thanks again John

Title: Re: front brake pad clunks when hot
Post by Jonnycab on Aug 20^th, 2011, 4:26am

John.....please disregard my previous post & I hope you didn't pay out for new calipers on my account...

.....My brakes are back to clonking & moaning again >:(

I am now completely perplexed ???.....It's as though, as soon as the copper grease starts to get a bit old then front brakes start to clonk & moan. Removing the pads, cleaning them & re-copper greasing them seems to sort the problem, but it still comes back after a while.

What to do eh ? :-/...changed the calipers, tried different carriers, new sliding pins & seals, various sets of pads, different discs & the caliper bolts are tight.......but to no avail ???

Is it possible that pattern pads just aren't made to original spec anymore ?. And seeing as they are the same pads as Mk1/2 Mondeo, then it would be interesting to find out if any Mondeo owners have reported the same problem in their forums.

Adds a new meaning to the phrase....'Clunk, Click, every trip' ::)

Title: Re: front brake pad clunks when hot
Post by amigafan2003 on Aug 20^th, 2011, 8:26am

on 04/15/11 at 03:29:49, Jonnycab wrote:

I have the moaning in reverse but not clonking when applied - although I'm sure they knock a little when going over rough surfaces - changed inner track rods, drop links and bushed so it's not the suspension knocking.

Title: Re: front brake pad clunks when hot
Post by pedropedro on Aug 20^th, 2011, 8:40am

Jonny....I didnt change the caliper as I had changed the carrier and i thought only play in that would cause the clunk...it is movement of the pad for sure in mine causing the clunk but dont know how to fix.....modern pads have clips to fill that space so thinking about folding some stainless to fabricate something to fit over end of pad........thanks for note though..

Title: Re: front brake pad clunks when hot
Post by PJDavis on Aug 20^th, 2011, 6:15pm

Old Fiesta Mk1 pads I think had the very clip you's are looking for. That and Escort mk4 with vented discs. I believe you can still get them from Ford, as a pack of 10.

Title: Re: front brake pad clunks when hot
Post by pedropedro on Aug 20^th, 2011, 7:10pm

thanks for that will try and source them; tried google no luck .. any idea where to get them? maybe answer to my problem !

Title: Re: front brake pad clunks when hot
Post by Mike H on Aug 21^st, 2011, 6:00pm

It does sound like clearance tolerances re pad in caliper ~ another option is too tight of course ;D

Title: Re: front brake pad clunks when hot
Post by Mike H on Aug 21^st, 2011, 6:05pm

Just had a thought ~ check that the pads haven't worn wedge-shaped ~ slightly thinner at the back edge vs the front edge ~ I had this problem with Brembo's a while back. Just a wild thought but may mean extra movement when closing up, if you see what I mean (?)

Title: Re: front brake pad clunks when hot
Post by pedropedro on Aug 21^st, 2011, 6:11pm

new pads tried different makes,,,,side play of about 1.5mm ..new carrier didnt help

Title: Re: front brake pad clunks when hot
Post by pedropedro on Aug 25^th, 2011, 8:50am

Attn Jonnycab! this seems to have fixed mine.....ran a 3mm tap into both edges of pad ran in x2 3mm socket screws x6mm long ......superglued then broke threads so still tight

This is image

http://s204.photobucket.com/albums/bb243/litechnica/?action=view&current=pads.jpg

adjusted so snug in carrier dollop of copper grease ...no clunking

whether those grubs screws will wear down i dont know but theyve got rid of the side play ...john

http://s204.photobucket.com/albums/bb243/litechnica/?action=view&current=pads.jpg[

Title: Re: front brake pad clunks when hot
Post by gozz on Aug 25^th, 2011, 9:27am

pedropedro.
Only the higher end of the pad plate touches the caliper,one screw would do it.I always find it necessary to dress the abutment points as the pads are too tight,even when the housings are perfectly clean,opposite situation to yours.
GOZZ.

Title: Re: front brake pad clunks when hot
Post by pedropedro on Aug 25^th, 2011, 11:22am

yes thanks for noting....when i did the mod I couldnt remember which edge touches the caliper so did both to be sure ! it's odd when Ive had a new carrier fitted that there's a space; tried different pads only very small difference in widths

Title: Re: front brake pad clunks when hot
Post by Jonnycab on Aug 27^th, 2011, 3:27am

Nice work John ;)

So is it that pads aren't made to original specs anymore ?....cos I've never had this problem before up until about 18 months ago ???

Are they now made in China or summut ? ::).....What is the world coming to when you have to modify brand new brake pads so that they fit properly ???

Title: Re: front brake pad clunks when hot
Post by Mike H on Aug 27^th, 2011, 4:25pm

Yes does look like the dimensions have changed somewhere along the line