Series 3 brake pedal vacuum
#1
Series 3 brake pedal vacuum
Hi all
I've got a new problem that's just cropped up... The brake pedal has a constant hissing sound when I push it, it gets louder the harder I press it. I'm assuming a vacuum leak... But brake systems are new to me... Also, when shes been on the freeway and all nice and warm, her brakes go a little spongy... Any ideas of what to start with? I don't fancy losing them...
Many thanks.
I've got a new problem that's just cropped up... The brake pedal has a constant hissing sound when I push it, it gets louder the harder I press it. I'm assuming a vacuum leak... But brake systems are new to me... Also, when shes been on the freeway and all nice and warm, her brakes go a little spongy... Any ideas of what to start with? I don't fancy losing them...
Many thanks.
#2
Join Date: Mar 2008
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#3
#4
So I gather it's definitely the brake booster... Are the XJ6 and XJ12 and XJS boosters interchangeable? Any tips on year models to watch out for?
Also, was this booster used on any other cars? as you can imagine, I wanna replace it.
I've also heard of rebuilds... Any good? Anyone ever done this?
Any help is much appreciated.
Also, was this booster used on any other cars? as you can imagine, I wanna replace it.
I've also heard of rebuilds... Any good? Anyone ever done this?
Any help is much appreciated.
Last edited by NathanDD6; 01-28-2016 at 05:28 AM. Reason: Added info
#5
Right so I tackled the job myself, took the booster apart, fixed the problem (slit in the second diaphragm, unknown cause) and put everything back together. Learnt a lot too.
If anyone wants to attempt stripping one of these boosters themselves, feel free to send me a message, email or whatever. Not as hard as it looked.
Cheers.
If anyone wants to attempt stripping one of these boosters themselves, feel free to send me a message, email or whatever. Not as hard as it looked.
Cheers.
#6
#7
Right so I tackled the job myself, took the booster apart, fixed the problem (slit in the second diaphragm, unknown cause) and put everything back together. Learnt a lot too.
If anyone wants to attempt stripping one of these boosters themselves, feel free to send me a message, email or whatever. Not as hard as it looked.
Cheers.
If anyone wants to attempt stripping one of these boosters themselves, feel free to send me a message, email or whatever. Not as hard as it looked.
Cheers.
The following users liked this post:
NathanDD6 (02-22-2016)
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#8
Right so I tackled the job myself, took the booster apart, fixed the problem (slit in the second diaphragm, unknown cause) and put everything back together. Learnt a lot too.
If anyone wants to attempt stripping one of these boosters themselves, feel free to send me a message, email or whatever. Not as hard as it looked.
Cheers.
If anyone wants to attempt stripping one of these boosters themselves, feel free to send me a message, email or whatever. Not as hard as it looked.
Cheers.
#9
Greetings goodgame, first off I am wondering if you have a workshop manual for removing the booster? If not I'll guide you through the removal, pretty simple, just got to know what to do.
Then is to take it apart, I used a 13mm spanner to pry the dents/lugs out, you will notice that they are in 4 sets of 3, loosen 3 of those sets, then, with the master cylinder off, use a length of wood or whatever you have, and twist it off, careful now, there's a fairly strong spring in there, you wont want it jumping up at you, keep clear of its path, keeping the wood ontop will assure it wont go flying, relax, it isn't super strong, can be compressed with 2 hands.
I'll go further if need be, maybe a word doco is in order? Thoughts?
Then is to take it apart, I used a 13mm spanner to pry the dents/lugs out, you will notice that they are in 4 sets of 3, loosen 3 of those sets, then, with the master cylinder off, use a length of wood or whatever you have, and twist it off, careful now, there's a fairly strong spring in there, you wont want it jumping up at you, keep clear of its path, keeping the wood ontop will assure it wont go flying, relax, it isn't super strong, can be compressed with 2 hands.
I'll go further if need be, maybe a word doco is in order? Thoughts?
The following users liked this post:
Lagonia (02-22-2016)
#10
#11
#13
Greetings goodgame, first off I am wondering if you have a workshop manual for removing the booster? If not I'll guide you through the removal, pretty simple, just got to know what to do.
Then is to take it apart, I used a 13mm spanner to pry the dents/lugs out, you will notice that they are in 4 sets of 3, loosen 3 of those sets, then, with the master cylinder off, use a length of wood or whatever you have, and twist it off, careful now, there's a fairly strong spring in there, you wont want it jumping up at you, keep clear of its path, keeping the wood ontop will assure it wont go flying, relax, it isn't super strong, can be compressed with 2 hands.
I'll go further if need be, maybe a word doco is in order? Thoughts?
Then is to take it apart, I used a 13mm spanner to pry the dents/lugs out, you will notice that they are in 4 sets of 3, loosen 3 of those sets, then, with the master cylinder off, use a length of wood or whatever you have, and twist it off, careful now, there's a fairly strong spring in there, you wont want it jumping up at you, keep clear of its path, keeping the wood ontop will assure it wont go flying, relax, it isn't super strong, can be compressed with 2 hands.
I'll go further if need be, maybe a word doco is in order? Thoughts?
#14
I used a sealant from Liqui Moly, don't know what you have in your part of the world. Yes it should work, depends if it has to flex or not.
This is where I wish I'd paid attention in maths class... The best I can explain is "square section" or maybe a suitable sized (ruler length) "beam" of wood.
Do you have a workshop manual? If you'd like my word doco please email me, Don't know if i can attach it here.
This is where I wish I'd paid attention in maths class... The best I can explain is "square section" or maybe a suitable sized (ruler length) "beam" of wood.
Do you have a workshop manual? If you'd like my word doco please email me, Don't know if i can attach it here.
#15
I used a sealant from Liqui Moly, don't know what you have in your part of the world. Yes it should work, depends if it has to flex or not.
This is where I wish I'd paid attention in maths class... The best I can explain is "square section" or maybe a suitable sized (ruler length) "beam" of wood.
Do you have a workshop manual? If you'd like my word doco please email me, Don't know if i can attach it here.
This is where I wish I'd paid attention in maths class... The best I can explain is "square section" or maybe a suitable sized (ruler length) "beam" of wood.
Do you have a workshop manual? If you'd like my word doco please email me, Don't know if i can attach it here.
The following users liked this post:
NathanDD6 (02-22-2016)
#16
I know it's been a while since this posting, but do you still have the word document? I'd need to repair my booster and all pieces of advise would be appreciated.
Also, how did you fix the slit diaphragm? Replaced or repaired it (how?)?
#17
Disregard. Just saw the later posts that were below ads and couldn't find a way to delete a reply.
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NathanDD6 (06-03-2024)
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