Can I Fit A Brake Booster To The Pedal Box Of a 1990 XJS V12
#1
Can I Fit A Brake Booster To The Pedal Box Of a 1990 XJS V12
Hi Guys
Since the ABS Brake Pump on my 1990 XJS V12 Burnt out, I have been considering 'Retro Fitting' a Brake Booster
I've already found an XJS Master Cylinder to go on the Vacuum Brake Booster but would it be also possible to use my Original Pedal Box from my 1990 XJS V12
The reason being that I wouldn't have to alter or improvise the Brake Switch and all I would need to buy is the Vacuum Booster
Which I could get from a 'Car Breakers' as I 'believe' its exactly the same as fitted to a 1996 to 2004 XKR or XK8
If I undid those 4 Bolts just to the left of the Pedal Box Mounting Holes, would I be able to bolt on a Vacuum Brake Booster so I would be able to keep the Original Brake Light Setup
Since the ABS Brake Pump on my 1990 XJS V12 Burnt out, I have been considering 'Retro Fitting' a Brake Booster
I've already found an XJS Master Cylinder to go on the Vacuum Brake Booster but would it be also possible to use my Original Pedal Box from my 1990 XJS V12
The reason being that I wouldn't have to alter or improvise the Brake Switch and all I would need to buy is the Vacuum Booster
Which I could get from a 'Car Breakers' as I 'believe' its exactly the same as fitted to a 1996 to 2004 XKR or XK8
If I undid those 4 Bolts just to the left of the Pedal Box Mounting Holes, would I be able to bolt on a Vacuum Brake Booster so I would be able to keep the Original Brake Light Setup
#2
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orangeblossom (05-13-2018)
#3
#4
If I were you and in that situation, I'd see if I could get either the pump rebuilt or fit a Pre-ABS system and remove the sensors and gubbins.
You can get a good brake pedal and Master cylinder with booster for probably like £50. I mean, I'm selling a brake booster with master cylinder from my XJ8 which is the same as that from an XK8/XKR (they share the same parts). You can try it with that. But the brake servo/booster needs 4 equally spaced bolts. The ABS pedal mount block thing (the parts the actuator is mounted to) is like a one sided trapezoid shape...
You can get a good brake pedal and Master cylinder with booster for probably like £50. I mean, I'm selling a brake booster with master cylinder from my XJ8 which is the same as that from an XK8/XKR (they share the same parts). You can try it with that. But the brake servo/booster needs 4 equally spaced bolts. The ABS pedal mount block thing (the parts the actuator is mounted to) is like a one sided trapezoid shape...
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orangeblossom (05-13-2018)
#5
#6
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orangeblossom (05-13-2018)
#7
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#8
As I wrote above, go the XJ-S pre ABS system i.e. with the normal booster version unit. The XJ and XK ABS systems run TOTALLY different. The master cylinder only has TWO connections. The rest is sorted in the ABS hydraulic block with integrated pump.
Last edited by Daim; 05-13-2018 at 08:31 AM.
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orangeblossom (05-13-2018)
#9
Hi Daim
I don't quite understand what you mean
If you go for the Brake Booster System without ABS
Why do you say the rest is sorted in the ABS Hydraulic block with integrated pump
Surely if you have the Non ABS Booster System then you wouldn't have the ABS hydraulic block with integrated pump?
I don't quite understand what you mean
If you go for the Brake Booster System without ABS
Why do you say the rest is sorted in the ABS Hydraulic block with integrated pump
Surely if you have the Non ABS Booster System then you wouldn't have the ABS hydraulic block with integrated pump?
#10
Hi Daim
I don't quite understand what you mean
If you go for the Brake Booster System without ABS
Why do you say the rest is sorted in the ABS Hydraulic block with integrated pump
Surely if you have the Non ABS Booster System then you wouldn't have the ABS hydraulic block with integrated pump?
I don't quite understand what you mean
If you go for the Brake Booster System without ABS
Why do you say the rest is sorted in the ABS Hydraulic block with integrated pump
Surely if you have the Non ABS Booster System then you wouldn't have the ABS hydraulic block with integrated pump?
Last edited by Daim; 05-13-2018 at 09:56 AM.
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orangeblossom (05-14-2018)
#11
The following 2 users liked this post by Greg in France:
Daim (05-13-2018),
orangeblossom (05-13-2018)
#12
Hi Greg@Daim
Cheers! I've got it now but
One more question: Would you undo the Pedal Box (with the Brake Booster on it) from under the Bonnet or from inside the Car under the Dash
Where you would presumably have to stand on your head, as it does sound a bit of a nightmare to take one of these out
Unlike the ABS Pedal Box which can all be done from under the Bonnet in less than 30 minutes
Cheers! I've got it now but
One more question: Would you undo the Pedal Box (with the Brake Booster on it) from under the Bonnet or from inside the Car under the Dash
Where you would presumably have to stand on your head, as it does sound a bit of a nightmare to take one of these out
Unlike the ABS Pedal Box which can all be done from under the Bonnet in less than 30 minutes
#13
One more question: Would you undo the Pedal Box (with the Brake Booster on it) from under the Bonnet or from inside the Car under the Dash
Where you would presumably have to stand on your head, as it does sound a bit of a nightmare to take one of these out
Unlike the ABS Pedal Box which can all be done from under the Bonnet in less than 30 minutes
Where you would presumably have to stand on your head, as it does sound a bit of a nightmare to take one of these out
Unlike the ABS Pedal Box which can all be done from under the Bonnet in less than 30 minutes
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orangeblossom (05-13-2018)
#14
Hi Greg
While I know that the ABS Master Cylinder Actuator is held in by 4 Bolts that just screw in
What I wasn't sure about was how the Brake Booster is fixed into a donor Car and didn't know if it was the same fixing or whether you had to undo 4 Nuts underneath the Dashboard
While I know that the ABS Master Cylinder Actuator is held in by 4 Bolts that just screw in
What I wasn't sure about was how the Brake Booster is fixed into a donor Car and didn't know if it was the same fixing or whether you had to undo 4 Nuts underneath the Dashboard
Last edited by orangeblossom; 05-13-2018 at 05:37 PM.
#15
Are you talking about an XJS with the pre-ABS system? If so,the brake vacuum servo is bolted to the brake pedal casting by four studs and nuts (all clearly visible in my pics above) and the brake pedal casting itself is fixed onto studs on the bodywork by four nuts (one of which you can clearly see in the final pic above, just below the fluid reservoir). You undo the four nuts that hold the casting and the entire thing lifts out upwards, casting pedal and all.
If you are asking how the brake system is fixed in some other Jaguar model, I have no idea.
Last edited by Greg in France; 05-14-2018 at 01:51 AM.
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orangeblossom (05-14-2018)
#16
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orangeblossom (05-14-2018)
#17
Yup that's what I needed to know, I get that the Fixing Holes are the same but wondered if the earlier Cars
Used the 4 Stud Fixing that you can undo from under the Bonnet or used 4 Nuts and Bolts instead of 4 Studs
Which would make removing it more difficult, in the event that those nuts and bolts had gone rusty
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