Brake Pedal Spring

[geoberni]

Hi All
So as I'm overhauling the Master Cylinder due to it leaking, I thought I'd replace the Brake Pedal Spring while I'm in there.

Has anyone else had a Brake Pedal Spring from ESM recently?
It fits but it's pretty weak due to the length compared to the one I've taken out. 1/3rd longer than the old one, so not really under any tension when foot off the pedal.
Have they sent the wrong one?

20220206_162114.jpg (311.71 KiB) Viewed 2422 times

[les]

Maybe the clutch return spring has been sent——-part No— COM130. The brake spring is CBS149.

[philthehill]

The correct spring is as listed below.
https://www.morrisminorspares.com/brake ... ng-p829364

The top spring in the photo above looks to be a brake shoe return spring stretched to suit.
Have you got the floor cover in place? Until the floor is in place the tension on the spring is minimal.
To check place and secure a bar across the brake pedal opening to keep the pedal in the normal operating position then see what the spring tension is. Adjust the brake linkage whilst the floor is off and the pedal is in its normal operating position held by the bar.

[geoberni]

Phil
That's the one I ordered, but it doesn't say how long it is....
It wouldn't surprise me to find a repurposed Brake Shoe Return spring was in there, but it would have to have been carefully done, as the small hook would be bent back 360 degrees the opposite side....

I think Les is possibly right, they've sent a Clutch Spring in error.
Although it is the same number of turns on the spring....
I'll contact them and see what they say.

[philthehill]

You have the right spring.
The clutch return spring has the two hooks in the same plane.
The brake pedal return spring has the the two hooks at 90 degrees to each other because one end of the spring fits horizontally through the eye in the chassis leg and the hook at the other end fits into the two hole clevis pin at 90 degrees to the eye in the chassis leg.

[geoberni]

Very good point Phil
It just seems very soft as it so much longer, but then if I had a botched spring in their before....
It'll be a few days before I get a chance to do anything else to the car anyway, so it won't hurt to just check with them about the length.
It is brakes after all.....

[mowogg]

Has the chassi leg been changed?

My replacement leg come without the bracket for the return spring. I carelfull measured and replicated in thr new leg but if you did not do this it may have resulted in an incorrect spring mount and thus the new spring won't work

[geoberni]

Has the chassi leg been changed?

My replacement leg come without the bracket for the return spring. I carelfull measured and replicated in thr new leg but if you did not do this it may have resulted in an incorrect spring mount and thus the new spring won't work

Absolutely no idea, the last work of such significance was at least 22+ years ago, but given the relative positions of things, I doubt the spring bracket could be any further forward down the Chassis leg.

[olonas]

The lower of the two also looks to me like a throttle return spring. Located between the throttle lever at the carb. and a bracket on the exhaust.

[geoberni]

A quick response from ESM this morning, having sent them my photo as posted here, which shows the one they sent as being approximately 4" long.

Thanks for your message. I think you have been sent the incorrect spring. The ones I have here measure around 2 ¼ “ I will arrange for another to be sent out.

So, it'll be slightly shorter then the one I previously had in there and significantly shorter than the one they sent.

Although you have to question the initial selection of the wrong spring, you can't fault ESM for good response to problems when they do occur.

[geoberni]

Well, I just got the replacement spring sent by ESM.
It's the same 4" long.
Seems the guy at their end was only measuring the Spring body, not the overall length hook to hook.... although the new one they sent is about 1/16th" shorter.

[philthehill]

ESM are supplying the right spring.
If it is not suitable for your application you need to adjust the spring or make a new spring anchorage in the chassis leg.

[geoberni]

ESM are supplying the right spring.
If it is not suitable for your application you need to adjust the spring or make a new spring anchorage in the chassis leg.

It's probably just me, having got used to such a short strong spring since since I've had the car.
I can't believe the guy at ESM only measured the coils and not the overall (free) length.

[unclealec]

If I may jump into this thread; I have just gained access to the brake pedal by removing the gearbox cover.
I was investigating why the pedal return spring was weak.
It wasn't weak - it just wasn't!
The chassis shows signs or repair in this area. I think I espy the rusted remains of a bracket that at one time would have been welded to the floor of the chassis. Like the spring, it isn't there now.
My option now would seem to be to drill a hole in the offside vertical wall of the chassis and introduce some sort of anchorage for the spring when it arrives from ESM.
Unless any guru can suggest an easier way?

[philthehill]

Drill a hole in the bottom of the chassis leg from the underside of the chassis rail where you would like to anchor the forward end of the spring. Slip a split pin through the hole from the inside of the chassis leg, splay out the split pin so as to hold it in place. Slip the forward end of the spring through the eye of the split pin - maybe easier to attach the spring through the split pin eye before you insert the split pin in the hole. Attach the other end of the spring through the outer hole of the twin hole clevis pin and jobs done.
Good luck.
Phil

[unclealec]

Many thanks Phil. I will be doing that when the spring arrives.

[geoberni]

Well here's a photo of mine, since it's in bits at the moment. It'll confirm for you where the Lug should be (assuming mine is right of course).

20220214_200853.jpg (3.13 MiB) Viewed 2059 times

Phil's idea is pretty sound, the only other reasonable suggestion is to drill a hole, and bolt down your own little mounting lug.
If you haven't got a bit of scrap metal to make one, you can buy Washers with locking wire tabs on the side.

http://www.drcproducts.com/body/d58-20/pv01.jpg

[unclealec]

Well here's a photo of mine, since it's in bits at the moment. It'll confirm for you where the Lug should be (assuming mine is right of course).
20220214_200853.jpg

Phil's idea is pretty sound, the only other reasonable suggestion is to drill a hole, and bolt down your own little mounting lug.
If you haven't got a bit of scrap metal to make one, you can buy Washers with locking wire tabs on the side.

http://www.drcproducts.com/body/d58-20/pv01.jpg

Thanks Geoberni, very helpful.

I have scrap metal. I really do.

[myoldjalopy]

" I have scrap metal. I really do."
I hope you don't mean the car!

[unclealec]

I have a seemingly endless supply of things that i have kept because they will come in handy sometime.
My current success rate is about 0.1%.