Lotus Elan

precise size of front brake pistons

PostPost by: HardTop » Tue Jul 12, 2022 2:42 pm

Has anybody got the definitive dimensions for the front brake pistons primarily the diameter .
The tolerances on this dimension are also of interest

Thanks in advance for any info or sources
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PostPost by: mbell » Tue Jul 12, 2022 6:05 pm

What car/calipers? Elan v +2 had different brake setups on the front.
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
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PostPost by: Billmack » Tue Jul 12, 2022 6:20 pm

Id say plus or minus .0005 or 7 inches from the nominal size
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PostPost by: HardTop » Wed Jul 13, 2022 11:07 am

1970 elan s4
front caliper are I believe Girling 14LF

values so far
48.1 mm
OR 1 and 7/8 inches = 47.625 mm
real values and tolerances would be appreciated
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PostPost by: 69S4 » Wed Jul 13, 2022 11:57 am

I have 48.05mm on two pistons - one new, one used.
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PostPost by: rgh0 » Wed Jul 13, 2022 12:10 pm

I measured 6 original pistons in good condition with no significant wear with a calibrated quality micrometre with zero error at 50.00 mm

Measurements were 48.10 mm +/- 0.02mm

cheers
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PostPost by: 2cams70 » Wed Jul 13, 2022 12:36 pm

Any reason why this dimension is important to you?
1970 Ford Escort Twin Cam
1972 Ford Escort GT1600 Twin Cam
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Peugeot 505 GTI Wagons (5spdx1) (Autox1)
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PostPost by: Craven » Thu Jul 14, 2022 2:21 pm

As the originals are hard chrome plated I doubt the precise diameter is closely controlled. Surface finish more likely.
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