displaying posts 1 to 13 of 13

Author Subject: Both front calipers sticking
idnan

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Location: Birmingham

Registered: 05 Sep 2007

Posts: 294

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Post #1
Was working on my car this weekend and found out that both my front calipers stick and drag when in use. I greased up the sliders on both sides with red rubber grease and it didn't make much of a difference. Within a few pumps of the brake pedal, they were sticking again. They are not seized solid, but there is a fair bit of dragging when I spin the wheels with my hands. They both feel as though they are sticking the same amount.

Without taking the calipers apart, I can't really see what the pistons are like. The piston dust seals are in good condition on both sides. There are no visible leaks around the servo or master cylinder. One thing I did notic is that I bled the front brakes a month or two back and since then the pedal has gone quite soft.

Whats the best course of action? I realise that it could be the servo, the servo rod, master cylinder, brake flexihoses or the calipers themselves. Is there any way to exclude some of these or is it a case of replacing everything until they are sorted?
Posted 15th Jun 2010 at 00:15
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #2
quite normal to have some rubbing, but if they are really sticking and building up heat then I'd look at possibly the front brake flexi's past it, or the pistons seized.

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Posted 15th Jun 2010 at 00:21
idnan

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Location: Birmingham

Registered: 05 Sep 2007

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Post #3
Thanks for the reply, I did notice smoke coming from the NS disc when I took it for a drive yesterday so was worried it was a problem.

I think I'll change the front flexi hoses for braided ones and get some reconned calipers. I checked the price for the seals, pistons and sliders from Brakeparts and it came to £88. I would normally give it a go but I've never done them before, so I'll get in touch with Carl and see if he still does those caliper exchanges.
Posted 15th Jun 2010 at 00:26
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #4
indeed, probably cheaper in the long run to just swap the calipers Smile

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Posted 15th Jun 2010 at 00:36
tvrfan007

Seasoned Pro

Location: In the garage

Registered: 29 May 2005

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Post #5
Hang on a minute - why are calipers that you haven't checked being condemned?

Both piston boots were fine however one of my pistons was stuck because it had dried out solid. So much so i couldn't even get the piston back in. I laced it under the piston seal with red rubber grease, gave it a good hiding on the way to work, and repeated the next night. Was beautifully smooth the day after and still is after 6K.

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Posted 15th Jun 2010 at 02:31
idnan

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Location: Birmingham

Registered: 05 Sep 2007

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Post #6
Ah, forgot to say when I greased the sliders on Saturday, I used a G clamp to push the pistons back in so I could refit the calipers. The pistons went in with reasonable force.

At the moment I'm going to replace the flexi hoses first as they are the cheapest to do. I will try putting some red rubber grease under the main seal whilst I'm there and see if it makes a difference.
Posted 15th Jun 2010 at 02:36
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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Post #7
I was going to suggest that red rubber grease mixed with brake dust forms an excellent glue! Whip them off, remove the pistons and give it all a thourough clean up, refit with fresh rubber grease and give it a try the brakes again before you shell out unenecessarily on new ones.

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Posted 15th Jun 2010 at 02:38
idnan

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Location: Birmingham

Registered: 05 Sep 2007

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Post #8
How difficult is it to remove and refit the pistons into the calipers?

I've never done it before but wouldn't mind giving it a try to save me shelling out on new ones. Also, how would I remove the piston? I've got 'normal' tools but no airline etc to push the pistons out.
Posted 15th Jun 2010 at 02:42
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

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Post #9
do one side at a time and you can use pedal pressure to pop them most of the way out, water pump pliers on the ridge away from the bore of the piston to get it out the last bit if needed.

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Posted 15th Jun 2010 at 02:45
idnan

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Location: Birmingham

Registered: 05 Sep 2007

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Post #10
Doesn't sound to bad. Where you say 'on the ridge away from the bore of the piston', do you mean on the outer part of the piston, past the ridge where the inner seal goes? Rather than the part of the piston that moves inside the caliper
Posted 15th Jun 2010 at 02:52
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #11
yeah exactly thatSmile

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 15th Jun 2010 at 02:53
rich-6

Seasoned Pro

Location: Bottoming out!

Registered: 06 May 2007

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Post #12
Did you whip the sliders out or just grease under the boot?

Mine had siezed on the o/s, So i whipped them out which was a c*nt of a job, got some scotchbrite and cleaned everything up, bit of a degrease and grease the lot back up again.

Worked a treat Smile Still fine now

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Posted 15th Jun 2010 at 04:11
idnan

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Location: Birmingham

Registered: 05 Sep 2007

Posts: 294

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Post #13
I removed the sliders completely and cleaned and regreased them. They were quite free has I greased them up when I did the pads not too long ago.
Posted 15th Jun 2010 at 06:18

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