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Brake booster non-return valve

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"Paul G. Edelstein"

Brake booster non-return valve
« on: April 11, 2019, 08:40:50 PM »
Greetings, all.



The non-return valve on my TR8 brake servo/booster has stopped working -

i.e. it no longer holds the vacuum in the booster.  When I shut off the car,

I can feel the pedal get hard in a second or two.



The part number for this item is 37H8278 (from TRF and Rimmer catalogs), but

it is no longer available or no longer supplied by any of the usual sources

(TRF, Moss, Rimmer, others).  Does anyone have a source for this part, or a

workaround?



Thanks in advance.



Cheers,  Paul E.







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Benjamin Zwissler

Re: Brake booster non-return valve
« Reply #1 on: April 11, 2019, 09:05:27 PM »
There are generic parts.  You just need to know the hose diameter.  I saw a

couple on Amazon, summit or even the local stores.



Ben

"Paul G. Edelstein"

Re: Brake booster non-return valve
« Reply #2 on: April 11, 2019, 09:08:22 PM »
Ben,







This part plugs in to the vacuum booster similar to TR6, hose goes on the

other end.  It is not the in-line kind that TR7s have.







Thanks.







From: Benjamin Zwissler [mailto:bjzwissler@gmail.com]

Sent: Thursday, April 11, 2019 21:04

To: Paul G. Edelstein

Cc: tr8@mercury.lcs.mit.edu List

Subject: Re:  Brake booster non-return valve







There are generic parts.  You just need to know the hose diameter.  I saw a

couple on Amazon, summit or even the local stores.







Ben

Benjamin Zwissler

Re: Brake booster non-return valve
« Reply #3 on: April 11, 2019, 09:11:28 PM »
My TR 8 has it in the line but it could have been changed before I got it

25 years ago.  Regardless summit also has generic booster mounted ones,

even in chrome.

DAVID MASSEY

Re: Brake booster non-return valve
« Reply #4 on: April 12, 2019, 07:40:35 AM »
It is good that your are checking the check valve first.B  The other possible

cause is a ruptured diaphragm in the booster.B  But check the valve first as

it is easy and it is cheap (relatively) if that is the cause.B  You can remove

it and try blowing though it in both directions.B  If it has failed you will

be able to blow though in both directions.B  If it is good you will not be

able to blow through it in one direction and you may be able to in the other

direction with some effort.



Dave