Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login


Take the time to read our Privacy Policy.

holden05 Offline
#1 Posted : Wednesday, 1 May 2024 4:53:58 PM(UTC)
holden05

Rank: Member

Reputation:

Groups: Registered
Joined: 23/04/2011(UTC)
Posts: 134

Thanks: 1 times
Was thanked: 2 time(s) in 2 post(s)
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
 1 user thanked holden05 for this useful post.
Smitty2 on 1/05/2024(UTC)
Smitty2 Offline
#2 Posted : Wednesday, 1 May 2024 7:55:22 PM(UTC)
Smitty2

Rank: Member

Reputation:

Groups: Registered
Joined: 6/07/2019(UTC)
Posts: 357
Australia
Location: bayside Melbourne

Thanks: 224 times
Was thanked: 27 time(s) in 27 post(s)
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?
Club circuit racing...the best fun you can have with your pants on
holden05 Offline
#3 Posted : Wednesday, 1 May 2024 8:21:35 PM(UTC)
holden05

Rank: Member

Reputation:

Groups: Registered
Joined: 23/04/2011(UTC)
Posts: 134

Thanks: 1 times
Was thanked: 2 time(s) in 2 post(s)
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)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,613

Thanks: 1 times
Was thanked: 490 time(s) in 467 post(s)
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.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
Smitty2 Offline
#5 Posted : Thursday, 2 May 2024 9:10:09 AM(UTC)
Smitty2

Rank: Member

Reputation:

Groups: Registered
Joined: 6/07/2019(UTC)
Posts: 357
Australia
Location: bayside Melbourne

Thanks: 224 times
Was thanked: 27 time(s) in 27 post(s)
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

Club circuit racing...the best fun you can have with your pants on
HK1837 Offline
#6 Posted : Thursday, 2 May 2024 10:04:56 AM(UTC)
HK1837

Rank: Veteran

Reputation:

Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,613

Thanks: 1 times
Was thanked: 490 time(s) in 467 post(s)
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.
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?
holden05 Offline
#7 Posted : Thursday, 2 May 2024 6:10:28 PM(UTC)
holden05

Rank: Member

Reputation:

Groups: Registered
Joined: 23/04/2011(UTC)
Posts: 134

Thanks: 1 times
Was thanked: 2 time(s) in 2 post(s)
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
Users browsing this topic
Guest
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF | YAF © 2003-2024, Yet Another Forum.NET
This page was generated in 0.065 seconds.