slight brake upgrade ? ammended to a source of OE calipers

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Re: slight brake upgrade ?

Postby Rambo » Fri 30.06.2017, 20:22

dapinky wrote:
Rambo wrote:I just measured the piston on an old OEM caliper with a ruler and it was approx. 47 mm. WTF :smt104

Confused :smt017


Mark,

Did you measure across the exposed face (which bears on the pad) or across the main body of the piston (which acts against the rubber seal)? - the 2 measurements are different.


I suspect I took the wrong measurement :oops:
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Re: slight brake upgrade ?

Postby Brit-Car-Nut » Fri 30.06.2017, 22:41

Mark:

It is the diameter that goes/slides against the o-ring /seal in the caliper body. I believe the pad end is a bit smaller in diameter.

I dragged out a used OEM front caliper and started glass bead blasting it to make it easier to work with. I will measure the piston tomorrow.

I also have a "rebuilt" caliper from Rock Auto that claims to be 54mm and I will open it and measure it as well.
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Re: slight brake upgrade ?

Postby Brit-Car-Nut » Sat 01.07.2017, 13:25

Sorry, but measuring the "stock" caliper turned out to be a nightmare.
The stock calipers came in the boot of a car I bought years ago and just got thrown up on the shelf for future maintenance BUT they are so badly rusted they will require some dynamite to get the piston(s) out.

I also got a pair of used calipers from Cliff a few years ago - when he did a brake upgrade, so went to get those but his calipers are nothing like the stock ones I have. Must have been an earlier upgrade...

The Rock Auto REBUILT calipers will be here later today, so I will at least measure them.

The stock calipers definitely have a reduced diameter at the brake pad end, so must be pushed/pumped out a bit to reach the real OD.
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Re: slight brake upgrade ?

Postby Brit-Car-Nut » Thu 06.07.2017, 15:51

Finally got time to pop out a piston and the:

AUTOSPECIALTY/KELSEY-HAYES 4013007 Includes: Caliper, Hardware, and Pads @ $18.67
AUTOSPECIALTY/KELSEY-HAYES 4013008 Includes: Caliper, Hardware, and Pads @ $18.67

Are really 52mm pistons not 54mm as they advertise. Quite a deal - 2 calipers with hardware and pads for $37.34 (around £29.00) plus postage.

Stock is limited. They are being closed out and will be gone forever when stocks are depleted.

Caliper.jpg
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Re: slight brake upgrade ?

Postby lotustonybassplayer » Thu 06.07.2017, 18:29

Thanks for measuring the pistons John . Maybe i should rename the thread :oops: . But as you say a bargain price for some off the shelf replacement standard calipers that are cheaper than a rebuild kit :-D
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Re: slight brake upgrade ?

Postby CalElan » Fri 07.07.2017, 01:33

$51 shipped for a pair of calipers.. grabbed me a pair of those for the shelf!
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Re: slight brake upgrade ?

Postby ElanBRG » Mon 26.02.2018, 21:45

Rambo wrote:
Brit-Car-Nut wrote:The bleed nipple has to be at the top if you ever expect to get all the air out of them


Totally agree. You'll never get the air out with bleed nipples at the bottom :?

PS from memory, piston size on OEM was 46 or 48 (not 52 or 54 mm) Unfortunately I don't have any Vernier calipers to give you an accurate measurement


For the bleed nipple at the bottom, the workaround is to just remove the caliper for bleeding so the nipple is on the top for that occasional operation.
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Re: slight brake upgrade ? ammended to a source of OE calipe

Postby Brit-Car-Nut » Mon 26.02.2018, 21:54

Actually, the calipers are labeled as "left" and "right" based on their position on the LeMans. Those calipers are at the rear of the hub. The M100has the calipers at the front, so you need to swap positions. You always want to put the bleeder as high up as possible. That is how they are designed to work.

The rear calipers have the same issues and solution.
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