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 Brake fade 
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Firing on two.

Joined: August 17th, 2010, 11:47 pm
Posts: 194
Location: Chichester West Sussex
Post Brake fade
Hi all , just recommissioning my 83 club and after being laid up for about 6 years the front brake calipers were sticking on so i purchased some used calipers and bled the system with new rubbers for the master cylinder reservoir. The other day after driving a bit the pedal did bugger all! After a few pumps I had brakes again. I got home and touched the calipers which were BOILING!, upon cooling down I seem to have pressure again..

A few things

I think the brakes may be ever so slightly binding on the front
There is no cooling shrouds fitted
I did not realise I had to centralise the calipers (from another car) to mine using shins or filing some off the gearbox side (would this really effect things?)
Do I need a new master cylinder?

The rears seem to let go ok

Many thanks in advance

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1972 dyane4 435cc


August 1st, 2018, 11:24 pm
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Firing on two.
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Joined: October 22nd, 2014, 10:59 pm
Posts: 1994
Location: South-Limburg
Post Re: Brake fade
Could be dirt in the calipers that makes them sticky. I don't think the master cylinder is the problem.


August 2nd, 2018, 7:27 am
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Joined: March 21st, 2013, 12:04 am
Posts: 1577
Location: Exeter, Devon
Post Re: Brake fade
Possibly the brakes are not riding back off the disks as AZL57 suggests

Is the handbrake binding?

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


August 2nd, 2018, 8:16 am
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Firing on two.

Joined: April 20th, 2017, 10:55 pm
Posts: 107
Post Re: Brake fade
If you are saying the secondhand calipers have just been fitted (recommissioned after six years), did you fit new seals to the secondhand calipers, or use 'as is'? If the latter, they need overhauling with new seals as it sounds like the pistons are sticking allowing the pads to bind against the discs thereby generating heat sufficient to boil the fluid - hence no brakes.


August 2nd, 2018, 9:07 am
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Firing on two.

Joined: August 17th, 2010, 11:47 pm
Posts: 194
Location: Chichester West Sussex
Post Re: Brake fade
Just had a quick look before work (greasy AGAIN) yes the nsf is binding I bought the calipers as “reconditioned” from classic 2cv recycling not impressed! Thanks for your help on here I hate mucking about with brakes on the 2cv grr

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1972 dyane4 435cc


August 2nd, 2018, 9:43 am
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Firing on two.

Joined: April 9th, 2010, 12:21 am
Posts: 463
Location: West Sussex
Post Re: Brake fade
Two Chevrons wrote:
...... “reconditioned” from classic 2cv recycling.....

reconditioned using silver aerosol?


August 2nd, 2018, 6:05 pm
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Firing on two.

Joined: December 21st, 2014, 7:33 pm
Posts: 866
Location: Rhayader Mid Wales
Post Re: Brake fade
I've had three purchases from that seller and every one had some issues with the part supplied, I won't be buying from there again.

https://www.ecas2cvparts.co.uk/caliper- ... 1e7d202d4c

Why not refurbish existing? Or, https://www.ecas2cvparts.co.uk/brake-ca ... 1e7d202d4c

It's brakes so it's got to be right :) .


August 2nd, 2018, 10:07 pm
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Firing on two.

Joined: August 17th, 2010, 11:47 pm
Posts: 194
Location: Chichester West Sussex
Post Re: Brake fade
Thanks again, interesting! I ordered some new ones from ecas as I can’t be assed to be mucking about my back won’t take it! Anyway ecas rang me today which was nice at least to say they forgot my order and I won’t receive them until Monday now. I rang martyn and he swears that the man he uses bench tested them so I stripped them down again and managed to bolt the caliper together together and use the cars hydraulic system to get the pistons out, to be fair they came out ok ish, I squirted some gt85 on the pistons when I pressed them back in and worked them in and out a few times (AWKWARD!) re fitted the caliper and re bled again, went for a drive not binding but the caliper still gets warm to touch, warmer then the offside, still need to source some cooling shrouds and install apparently it’s a bitch of a job, are the calipers meant to get warm? I done about 4-5 miles and used the brakes and they se m to be letting go ok. Just the calipers getting warm I’m a bit concerned about, maybe with ise they will free up..

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1972 dyane4 435cc


August 2nd, 2018, 11:48 pm
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Firing on two.
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Joined: October 22nd, 2014, 10:59 pm
Posts: 1994
Location: South-Limburg
Post Re: Brake fade
Did you put the thin distance plates between brake claws and gearbox?


August 3rd, 2018, 8:10 am
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Firing on two.

Joined: August 17th, 2010, 11:47 pm
Posts: 194
Location: Chichester West Sussex
Post Re: Brake fade
AZL57 wrote:
Did you put the thin distance plates between brake claws and gearbox?

Yes I did, both sides have them

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1972 dyane4 435cc


August 3rd, 2018, 8:21 am
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