Series 1 xj6 brake booster
#1
Series 1 xj6 brake booster
Hello everyone,
I introduced myself a few months ago as a 97 xjr owner,
Prior to that I've had a 85 S3 and a 72 S1 XJ6
I wanted to sit in England again so I've got another 72 XJ6.
higher
I need some assistance with the brake booster, no obvious signs of leaking, but the brake application is harder than what I remember for an S1 and the pedal seems to need more pressure when I'm stopped at a light (car seems to want to creep forward) or a stop sign. Not losing any fluid
Are boosters from an S2 comparable with the S1 master? I can't seem to find any boosters for sale prior to 1975.
Would like to sort this out sooner than later for obvious reasons so any advice or suggestions would be welcome.
Cheers
cds
I introduced myself a few months ago as a 97 xjr owner,
Prior to that I've had a 85 S3 and a 72 S1 XJ6
I wanted to sit in England again so I've got another 72 XJ6.
higher
I need some assistance with the brake booster, no obvious signs of leaking, but the brake application is harder than what I remember for an S1 and the pedal seems to need more pressure when I'm stopped at a light (car seems to want to creep forward) or a stop sign. Not losing any fluid
Are boosters from an S2 comparable with the S1 master? I can't seem to find any boosters for sale prior to 1975.
Would like to sort this out sooner than later for obvious reasons so any advice or suggestions would be welcome.
Cheers
cds
#2
No idea on comparability, but I'd start with checking for leaks, find the hose that supplies vacuum to the booster and suck on it, does it hold pressure? Next step is to suck while someone applies the brakes. Should hold a vacuum, if so then look elsewhere for problems. Let us know what you find.
#5
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You might as well get a new master cylinder while you're at it and never have to touch either of them for years.
(';')
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LnrB (09-08-2016)
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A bit fuzzy here, but t might help a bit.
1. I seem to recall that the plastic bit that fits into a grommet at the booster is not a one way valve at all, merely a fitting. Elinor might be referring to seeking to stop a leak there with RTV.
It seems that a one way valve would be needed. perhaps it is on the manifold or on the line near there.
Pause:
I went out to the garage and checked my 83! Confirmed. Red plastic spigot at the bellows. Metalic one way valve about two inches away in the line to the intake. Different car, yes. Concept the same.
2. Nathan's idea on checking the system for a leak is sound. If you want to finesse that, HF sells a slick "MItty Valve/pump. Guage included. Pump the booster down, close, observe the guage. will it hold a vacuum or does air seep in and the numbers go down.
Also, adaptable to brake bleeding that is more sophisticated than the squirt on the floor method.
I've a dim recollection of a bellows rebuild service in the Nw USa???
CArl
1. I seem to recall that the plastic bit that fits into a grommet at the booster is not a one way valve at all, merely a fitting. Elinor might be referring to seeking to stop a leak there with RTV.
It seems that a one way valve would be needed. perhaps it is on the manifold or on the line near there.
Pause:
I went out to the garage and checked my 83! Confirmed. Red plastic spigot at the bellows. Metalic one way valve about two inches away in the line to the intake. Different car, yes. Concept the same.
2. Nathan's idea on checking the system for a leak is sound. If you want to finesse that, HF sells a slick "MItty Valve/pump. Guage included. Pump the booster down, close, observe the guage. will it hold a vacuum or does air seep in and the numbers go down.
Also, adaptable to brake bleeding that is more sophisticated than the squirt on the floor method.
I've a dim recollection of a bellows rebuild service in the Nw USa???
CArl
#11
Hello all,
I believe it is a one way valve, it's been awhile since I had an s3 so I can't remember if it was external.
I can't seem to find a diaphragm in any of the rebuild kits so I'm going to go with Either suggestions of new/rebuilt servo and possibly going through the master cylinder as well.
The car is rather new to me.
I just dread bleeding the rear brakes.....
I'll post once I've sorted it out,
Regards
cds.
I believe it is a one way valve, it's been awhile since I had an s3 so I can't remember if it was external.
I can't seem to find a diaphragm in any of the rebuild kits so I'm going to go with Either suggestions of new/rebuilt servo and possibly going through the master cylinder as well.
The car is rather new to me.
I just dread bleeding the rear brakes.....
I'll post once I've sorted it out,
Regards
cds.
#13
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A Mitty Vac sourced from HF might assist in the bleed process.
If new hoses planned, a good idea, even if mission creep, why not
new bleed screws?
Way back, a decade or more, I was having trouble bleeding the cylinders of our 71 AMC Hornet. Actually a Rambler!! Nice car, bought at a bargain and with a story !!!
Dear departed wife's assigned car. So, her assignment was "pump
and hold"! Wasn't working??? Fired up the 258 CI six to get boost.
All right, got clean squirts, sans bubbles. Old tech, squirt on the floor. Success. Wife thought I was a genius.
Carl
If new hoses planned, a good idea, even if mission creep, why not
new bleed screws?
Way back, a decade or more, I was having trouble bleeding the cylinders of our 71 AMC Hornet. Actually a Rambler!! Nice car, bought at a bargain and with a story !!!
Dear departed wife's assigned car. So, her assignment was "pump
and hold"! Wasn't working??? Fired up the 258 CI six to get boost.
All right, got clean squirts, sans bubbles. Old tech, squirt on the floor. Success. Wife thought I was a genius.
Carl
#14
JagCad,
I do have a mityvac, I used it to check for leaks in the vacuum lines, however I prefer to use my brother, we have a good routine after all these years.
Roger
I remember rebuilding the rear calipers of my previous 72 XJ6 bleeding wasn't impossible, maybe I'm thinking of bleeding a friends xke's rear brakes?
Anyhow, the hose suggestion have me thinking that maybe the pedal creep is due to swelling brake hoses?
LnrB
I rebuilt the earlier girling boosters in cortina's and
those in the later girling lockheed incarnations in élans and europas. Id do it again but either my googling is sub par (as Roger can attest to) and I can't seem to find a diaphragm for it. Aside, its my daily driver, so I don't want to be down for too long if I can help it. So thinking new for now.
regards
cds
(I'm using my initials as I am also a Carl and wish to avoid confusion)
I do have a mityvac, I used it to check for leaks in the vacuum lines, however I prefer to use my brother, we have a good routine after all these years.
Roger
I remember rebuilding the rear calipers of my previous 72 XJ6 bleeding wasn't impossible, maybe I'm thinking of bleeding a friends xke's rear brakes?
Anyhow, the hose suggestion have me thinking that maybe the pedal creep is due to swelling brake hoses?
LnrB
I rebuilt the earlier girling boosters in cortina's and
those in the later girling lockheed incarnations in élans and europas. Id do it again but either my googling is sub par (as Roger can attest to) and I can't seem to find a diaphragm for it. Aside, its my daily driver, so I don't want to be down for too long if I can help it. So thinking new for now.
regards
cds
(I'm using my initials as I am also a Carl and wish to avoid confusion)
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LnrB (09-12-2016)
#15
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CDS, A good name!!! For a good reason or a no mater reason, my boss after my return to civilian life after army service in 55 was a Carl. Did he feel a kinsmanship and offer me a job? Did I feel the same and accept ? I kinda think so. A fork in the road of my
career. It went well....
Why did my Dad's English/Irish/scotch parents choose a then unpopular German
name? We never knew....
Oh, my dear departed wifey was German born and raised. She had a cousin, Karl !
Cousin, his spouse and I got along well, not long after WWII in circa 53.
Names????
Carl
Carl
career. It went well....
Why did my Dad's English/Irish/scotch parents choose a then unpopular German
name? We never knew....
Oh, my dear departed wifey was German born and raised. She had a cousin, Karl !
Cousin, his spouse and I got along well, not long after WWII in circa 53.
Names????
Carl
Carl