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holden05 Offline
#1 Posted : Wednesday, 1 May 2024 4:53:58 PM(UTC)
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I’ve recently rebuilt the master cyl on my vc due to an internal leak
I’ve bled up the brakes with a power bleeder but I still have a real low pedal. How would I test is the booster is the problem
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Smitty2 on 1/05/2024(UTC)
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#2 Posted : Wednesday, 1 May 2024 7:55:22 PM(UTC)
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Originally Posted by: holden05 Go to Quoted Post
I’ve recently rebuilt the master cyl on my vc due to an internal leak
I’ve bled up the brakes with a power bleeder but I still have a real low pedal. How would I test is the booster is the problem


booster the problem with low pedal? unlikely (unless you played around with the booster pushrod which is not part of a Master rebuild)

low pedal... is air or poor sealing/seals usually.

did you make sure the seals are the right way on the pistons? don't larf ! PBR could (and did) get them the wrong way from new ...

also
What is the state of the hoses? new or 40 years old?
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holden05 Offline
#3 Posted : Wednesday, 1 May 2024 8:21:35 PM(UTC)
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Hey Smitty
When I installed the seals I followed the direction the old seals were facing
Hoses look ok
HK1837 Offline
#4 Posted : Wednesday, 1 May 2024 8:22:41 PM(UTC)
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And check the reaction pad hasn't dropped out. I chased low pedal and spongy brakes on a UC years ago with the same style master cyl as a VC. Drove me nuts for weeks until someone told me the reaction pad must have fallen out. Fitted a new one and it was back to how it should be.
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Smitty2 Offline
#5 Posted : Thursday, 2 May 2024 9:10:09 AM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
And check the reaction pad hasn't dropped out. I chased low pedal and spongy brakes on a UC years ago with the same style master cyl as a VC. Drove me nuts for weeks until someone told me the reaction pad must have fallen out. Fitted a new one and it was back to how it should be.


HK.. I agree, if the reaction disk in the booster has been affected, yep crappo pedal for sure !
but
the thread starter mentioned only a rebuild on a master and I can't see how that would affect the booster in any way

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HK1837 Offline
#6 Posted : Thursday, 2 May 2024 10:04:56 AM(UTC)
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The pad fell out on this UC inside the booster when I changed its master cylinder. It had crap pedal afterwards, and 4 different cylinders later an old brake bloke told me that was what it'd be. Got a new one and pushed it into the booster behind the master cylinder rod. From memory the rod came out with the master cylinder and the reaction pad (sometimes called reaction disc) came out behind it and fell down inside the booster.
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holden05 Offline
#7 Posted : Thursday, 2 May 2024 6:10:28 PM(UTC)
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From memory when I pull the master off, all there was was the pin coming out of the booster making contact with the booster piston
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