Td5 Def 90 rear caliper rebuild

guineafowl21 · Sep 6, 2018

Looking for stainless steel pistons - are the Britpart ones any good? If not, where can I get some decent ones?

I’ll use genuine seals as well - the Bearmach ones I used last time just didn’t fit properly.

Flossie · Sep 6, 2018

I use britpart SS pistons and seals/rings, never had a problem but I split the calipers so it's easy.
Fitting the rings is a pita if you don't.

guineafowl21 · Sep 6, 2018

Flossie said:
I use britpart SS pistons and seals/rings, never had a problem but I split the calipers so it's easy.
Fitting the rings is a pita if you don't.

Thanks.

Do you fit the piston before the wiper seal and ring, or put all the seals in then the piston?

Al2O3 · Sep 6, 2018

I used Britpart SS pistons too. Been in a few years now and all seems fine. I didn't split my calipers.

jamesmartin · Sep 6, 2018

guineafowl21 said:
Thanks.

Do you fit the piston before the wiper seal and ring, or put all the seals in then the piston?

fit all seals then pistons last,lube with a drop of brake fluid

Al2O3 · Sep 6, 2018

I've found some pictures.
The calipers back from being plastic coated.

inner seals in

Fitting outer seal in to holders

GENTLY pushing the outer seals in to place, working around with the G clamp.

The Britpart kit comes with piston lube.

Pistons pushed in.

Flossie · Sep 6, 2018

I do it a bit different, inner seal then piston then slide wiper seal and ring down the piston and tap ring home using a piece of steel tube over the piston. The tube fits perfectly and was found in my scrap pile.
It's important to really clean the recess that the ring sits into, rust and crud does build up there and causes fitting issues imho.
I've never had a problem with britpart seals/rings if that recess is clean.

dag019 · Sep 7, 2018

I split my calipers when I did mine and replaced the gallery seal at the same time. I fitted all of the seals (definitely buy genuine) as shown above by @Al2O3 , and then the piston at the end. If you split the caliper the radius arm washer is just the right size for hammering the retaining ring home. Although if you do hammer it give it a good hard sharp hit, if you try and gently tap it in it will deform and you will need another.

Incidentally depending on if you have parts yet I have a set of 4x 606696S new in their boxes if you are interested. I got them when I was doing mine without checking the parts manual properly, 110 rears are a different size

Td5 Def 90 rear caliper rebuild

guineafowl21

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Flossie

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guineafowl21

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Al2O3

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jamesmartin

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Al2O3

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Flossie

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dag019

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