MGB & GT Forum

I'm in the process of replacing my brake MC. I noticed that my pushrod doesn't seem to be correct.

The first photo shows the one I've got, that came off the car when I removed the old MC.

The second photo shows the pushrod from the Moss catalog.

My pushrod appears to be the one from the single line system used from 1962 - 1967. It has the little mushroom shaped end, the spacer and the circlip.

The one I have definitely came off the car and it worked before with no apparent problems.

Unfortunately, Moss does not have a replacement pushrod.

Is there any reason that I can't continue using the old pushrod? The only problem I have found so far is that it is very difficult to get the rubber boot over either end of the pushrod, but I'm sure that I can get it on.

The one I have is 3 inches long. Does anyone know how long the correct one is?

And, yes, I know that the clevis pin opening is worn into an oval shape.

Would it be safe to grind the mushroom off the end?

It appears that the only thing holding the pushrod in place if the clevis pin on the brake pedal and tension with the MC. Is that right?



Edited 1 time(s). Last edit at 2024-04-12 02:09 PM by noblepa.

Did the new master cylinder come with a pushrod fitted.

No. That is my quandry.

Since I posted, I have checked a couple of other suppliers in the UK. None of them have the pushrod available, either.

I also didn't see any supplier who lists an MC that includes the pushrod. This seems a bit odd to me, since the clutch MC's all have the pushrod included.

Take the old push rod and weld on a couple washers to give you round holes.

That's strange, as most of the ones i see on internet, in UK anyway come with pushrod fitted. The TRW one i bought had one fitted.

I'd check with Basil Adams here on the form - he can likely get you a new one for a great price and his shipping rates are reasonable.

No lengths mentioned that I saw....
Circlip/C-clip/snap ring... should fit in a slot in the master cyl.

Moss??

Flea-bay

Rimmer Bros.



Edited 1 time(s). Last edit at 2024-04-12 03:44 PM by Tbird.

The one you took off your car is the correct push rod. Do a search for Brake Master Cylinder Push Rod - part number 7H7985. Lots available but you might have to order from the UK. While you're at, suggest you also order the push rods for the clutch mster and slave cylinders.

Bob

Are you sure that is the correct one? This is the dual line non-servo system used from 1968-1977.

The Moss catalog shows a pushrod without the little mushroom on the MC end. It also does not show spacer and circlip that mine has. OTOH, the pushrod for the 1962-67 single line system DOES have both of those features.

There also does not seem to be anywhere for the circlip to lock into on either my old or new MC.

I tried Rimmer Bros. in the UK. Looking at their site, and at Clausager, it appears that the home market cars never used the dual circuit system that was standard for US cars. Rimmer Bros. doesn't even list a dual circuit MC. So, no luck there.

I’ve had my 68 MGB for 56 years and that kind of push rod has been on my B’s M/C for all 56 years. But, it could be different on other people ‘s MGs.

If you have a DUAL brake system, the SECND picture (Moss Part),is correct, the first picture is foe a single system

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IN ALL SUBJECTS.: For those who believe, no proof is needed. For those who don’t believe, no proof is possible.

"Strive for perfection in everything. Take the best that exists and make it better. If it doesn't exist, create it. Accept nothing nearly right or good enough"
Sir Henry Royce
co-founder of Rolls-Royce .

"I take no credit for my own, of another man's fame".
Joe Baba 2021

The pushrod as shown in your photo is available from Moss: https://www.moss-europe.co.uk/push-rod-brake-master-cylinder-17h7985.html?assoc=106963
and from Rimmer: https://rimmerbros.com/Item--i-17H7985
I did not check other suppliers but am sure that there are other sources. Simply search for item 17H7985.



Edited 1 time(s). Last edit at 2024-04-13 07:00 AM by Windmill.

The photo I included (as opposed to the drawing from the Moss website) is the one I have. It is for the single line system, not the dual line system that my car has.

Does anyone know of a source for the correct pushrod for the dual line system. The one I have seems to work, but it is not correct.

I think I may just grind the mushroom off and create the correct pushrod shape.

Also, does anyone have any idea exactly how long the correct (mushroom-less) pushrod is? I might be able to make one out some steel rod and a metal strap bent into the correct shape, welded together.

ANY, hardware store + AMAZOIN, sell 5/16" clevis threaded on the end for 5/16-24 thread. Buy one and a 5/16-24 bolt 6" long and cut to size. Once installed, there should be abut am 1/8" free play between the pushrod and the internal cup of the Master cylinder. I personally have made over a dozen this way. Cheers.

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IN ALL SUBJECTS.: For those who believe, no proof is needed. For those who don’t believe, no proof is possible.

"Strive for perfection in everything. Take the best that exists and make it better. If it doesn't exist, create it. Accept nothing nearly right or good enough"
Sir Henry Royce
co-founder of Rolls-Royce .

"I take no credit for my own, of another man's fame".
Joe Baba 2021