Lotus Elan

Caliper pistons

PostPost by: Keith Scarfe » Wed Mar 06, 2019 12:29 pm

I am in need of replacing the pistons in my rear calipers as they have gone corroded and seized a bit.
When looking at the suppliers there are standard types and Stainless steel ones (plus other race type stuff which I do not need).
I guess stainless are the best and would resist future corrosion. What is the fores and against of stainless pistons. Why would I not go for these?
Thanks.
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PostPost by: pharriso » Wed Mar 06, 2019 12:44 pm

Keith Scarfe wrote: Why would I not go for these?
Thanks.
Keith.


Expense.
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PostPost by: Keith Scarfe » Wed Mar 06, 2019 12:50 pm

pharriso wrote:Expense.


Great if that's the answer. Std ?12.50, Stainless ?18.50 (Paul Matty). Think I can justify that.
Anyone know of anywhere else that does stainless ones?

Cheers.
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PostPost by: 69S4 » Wed Mar 06, 2019 12:52 pm

I put stainless pistons in my rear calipers well over 20yrs ago and have not had to touch them since. Couldn't get stainless fronts at the time so put in a new set of std pistons. They started sticking few years back and had rust pits in front of the seals when I took them out last year. They were replaced with stainless. Both rears and fronts came from Matty's.
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PostPost by: Craven » Wed Mar 06, 2019 1:03 pm

Original pistons have a protective Hard Chrome finish, stainless material is an easy way to meet this requirement.
I doubt piston finish or quality as original steel are available.
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PostPost by: pharriso » Wed Mar 06, 2019 1:28 pm

Keith Scarfe wrote:
pharriso wrote:Expense.


Great if that's the answer. Std ?12.50, Stainless ?18.50 (Paul Matty). Think I can justify that.
Anyone know of anywhere else that does stainless ones?

Cheers.


I meant the only disadvantage of SS is the added expense, it's a no brainer though to fit the SS pistons as you will never have to touch them again.
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PostPost by: Keith Scarfe » Thu Mar 07, 2019 4:29 pm

Stainless ones bought.
Cheers All.
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PostPost by: MarkDa » Mon Mar 11, 2019 5:48 pm

I put SS rear pistons in 35 years ago and they are still as good as new.
If I recall chrome was not available at the time.
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