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Squealing brakes and C4 calipers on C2

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colin129
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2020/08/17 12:26:57 (permalink)

Squealing brakes and C4 calipers on C2

One of the items that has been annoying me is that, since I had the rears pads changed last year, they have been squealing really badly.  I asked them to sort it out when it was in for service and the 2 options suggested were:
 
1. Fit 28mm damping plates as replacements - may work, but not guaranteed.
 
2. Fit C4 calipers, a common modification and 4 pot instead of 2 pot so better braking.
 
It's just really annoying, because they have never squealed like this before, if at all.  They did take them out & refit them and it seemed to cut the noise down quite a lot at first, but it started to come back towards the the end of my 20 odd mile journey home.
 
I have done very few miles in the last year, so I'm wondering if a long journey, with some spirited driving and some hauls down from big speeds, may bed them in properly and stop the squealing.  I am considering a trip to the Evo Triangle since I won't be going to the South of France now  

Colin
964C2 Coupe 1990 Granite Grey 159K
944S2 1990 Guards Red - Gone & very sadly missed
BMW 318D - slow, slow, slow coach. Most disappointing car I have ever owned.

5 Replies

colin129
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Re: Squealing brakes and C4 calipers on C2 2020/08/17 13:04:56 (permalink)

Colin
964C2 Coupe 1990 Granite Grey 159K
944S2 1990 Guards Red - Gone & very sadly missed
BMW 318D - slow, slow, slow coach. Most disappointing car I have ever owned.
Hacki
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Hacki Guest of the Club
Re: Squealing brakes and C4 calipers on C2 2020/08/17 13:31:36 (permalink)
If memory serves, the OEM pads come with damping plates to cure noise problems. Sometimes copper paste between the rearside (!) of the pad and the piston is enough. And then there´re pads well known for squealing while others don´t squeal at all.
 
2 pot or 4 pot doesn´t make a difference in squealing, although it´s a common mod. If you´ve had no trouble with your brakes so far, the 2 pot caliper is fine for your driving style. When I started to take to the track with my 1990 C2 (2 pot) way back in 1991, I learned that the 2 pot rear brake gives up in no time. On the road they are fine.

Owner of an inflatable Spitfire and an escape glider
-2- RSRTC
Gordon Attar
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Re: Squealing brakes and C4 calipers on C2 2020/08/17 15:03:32 (permalink)
Its very likely they've fitted the wrong aftermarket brake pads to fit with the discs, or left the anti squeel shims of, check the make and ask the forum for there recommendations,  my memory from 15 years ago is telling me they should be Pagid or maybe Brembo.

Gordon
964 C2 Cab, 996TT
ex cars 944S2, 964 Targa, 944T, 993 Cab, 993 Targa, 993 C4S, 993TT, 996TT, 997TT, Cayenne Turbo
mcgc0
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mcgc0 Guest of the Club
Re: Squealing brakes and C4 calipers on C2 2020/08/17 16:31:05 (permalink)
With Hacki on this one. Also the best 'standard' pads will still be the Textars as fitted by Porsche. I was thinking about changing those to something like PFC but when talking to an indie specialist that supports 964 cup racing I was advised to stick to the Textars - they're perfect in all normal situations.
 
HTH

'90 964 C4 Velvet Red
'94 968 Sport Gaurds Red
'90 964 C4 Slate Grey
'03 Focus ST
'02 Focus ST
colin129
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Re: Squealing brakes and C4 calipers on C2 2020/08/18 15:53:11 (permalink)
Gordon Attar
Its very likely they've fitted the wrong aftermarket brake pads to fit with the discs, or left the anti squeel shims of, check the make and ask the forum for there recommendations,  my memory from 15 years ago is telling me they should be Pagid or maybe Brembo.


 
Usually they fit only Porsche parts, unless you specifically request something different.




Colin
964C2 Coupe 1990 Granite Grey 159K
944S2 1990 Guards Red - Gone & very sadly missed
BMW 318D - slow, slow, slow coach. Most disappointing car I have ever owned.
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