Can I swap the Brake Pedal from a 1990 XJS (ABS) with one from a Brake Booster XJS
#1
Can I swap the Brake Pedal from a 1990 XJS (ABS) with one from a Brake Booster XJS
Hi Guys
I am considering Retro Fitting my 1990 XJS that has ABS
With a Brake Booster System from another Car because my ABS Pump has burned out
Where the only problem (from my point of view) is that the operation of the Brake Light Switch is different
So either I'll have to improvise and rewire it in some way or else my 'Preferred Option' would be to Swap the Brake Pedal, so that I can keep the existing Brake Switch
Is it possible to do that and if so how would I do it ?
I am considering Retro Fitting my 1990 XJS that has ABS
With a Brake Booster System from another Car because my ABS Pump has burned out
Where the only problem (from my point of view) is that the operation of the Brake Light Switch is different
So either I'll have to improvise and rewire it in some way or else my 'Preferred Option' would be to Swap the Brake Pedal, so that I can keep the existing Brake Switch
Is it possible to do that and if so how would I do it ?
#2
The following users liked this post:
orangeblossom (05-14-2018)
#3
#4
Please, please, please stop looking for ways to avoid fixing the original system on your car! It was built to have the system it has, so messing around with braking systems is ill-advised. Plus it will probably make the car ininsurable or, if you don't declare the modifications to your insurer you will, unquestionably, invaidate your insurance.
The following users liked this post:
orangeblossom (05-14-2018)
#5
#6
The following users liked this post:
orangeblossom (05-14-2018)
#8
The Brake Booster System is simpler and so much more reliable and I'm also not a big fan of ABS
The following users liked this post:
89 Jacobra (05-14-2018)
#9
#10
Because before the normal breakers get them, the specialists, like Simply Performance and Just-XJS buy thrm in the UK. There is no such thing as XJ-S models on the scrap yard here.
The following users liked this post:
orangeblossom (05-14-2018)
#11
#12
You have plenty of protection from ebay as a buyer.
Bear in mind that these pumps are not failing left-right-and-centre. You have been unlucky to have one fail, let alone two, so I understand you may have the impresion that they are unreliable and all failure-prone. But you also have cars that have sat for long, long periods of time.
This system is really common and in all my years of having Range Rovers with them (probably 20 years) I haven't head of them failing or had any problems myself.
The following users liked this post:
orangeblossom (05-15-2018)
#13
Hi Bladerunner
Cheers for that helpful advice but today I took the Old Brake Pump apart, just to see what was in there and if it could be repaired
Which was a Nightmare to get open, as its got crushed in anti tamper rings presumably to stop you doing that
I'm going to do a full write up the next time that I update my 'Cherry Blossom Restoration' thread including Photos, so everyone can see whats inside
Keeping the Car Original is not really my thing, I just want to make it better where I can and since I have already got an XJS without ABS as well as some other XJS's that have
I can make a comparison between both of those systems and the one without the ABS is in my opinion a better Car to drive
After all they were using Brake Boosters in these Cars up until about 1987 so providing my Insurance Company is OK with it, then thats the way that I will probably go
Cheers for that helpful advice but today I took the Old Brake Pump apart, just to see what was in there and if it could be repaired
Which was a Nightmare to get open, as its got crushed in anti tamper rings presumably to stop you doing that
I'm going to do a full write up the next time that I update my 'Cherry Blossom Restoration' thread including Photos, so everyone can see whats inside
Keeping the Car Original is not really my thing, I just want to make it better where I can and since I have already got an XJS without ABS as well as some other XJS's that have
I can make a comparison between both of those systems and the one without the ABS is in my opinion a better Car to drive
After all they were using Brake Boosters in these Cars up until about 1987 so providing my Insurance Company is OK with it, then thats the way that I will probably go
#14
OB, have you thought about having the motor rewound ( reconditioned)? If you are rewiring a new system it is best to go to the Electric manual and see how Jag wired the original system and then pencil in your modification and follow that.
Last edited by afterburner1; 05-15-2018 at 12:41 PM.
The following users liked this post:
orangeblossom (05-15-2018)
#15
Hi Afterburner
Wait till you see the Photos of what I found when I took that ABS Pump apart, which I wasn't intending to do, as there are anti tamper locking tabs to prevent you from doing just that
But as 'Warrjon' said it could be done then I had to do it rather than be a 'Snowflake' and wimp out
As for the Vacuum Servo or Brake Booster as I call it, there is No Wiring up to do apart from the Brake Light Switch
Which taken in the Scheme of things is a minor inconvenience to wire up, being no more than just a couple of wires
And that is just about it, apart from from having to modify the Brake Pipes which looks a very easy job as I've made all the Brake Pipes on my Cars
Then there is just the Vacuum Tube to connect to the Inlet manifold and maybe an Aux Vacuum Tank to give you more capacity if needed
Where apart from anything else I'd like to make that Mod, as from my own personal viewpoint I feel that it is Safer and less likely to go wrong
As I've had the ABS go bad on 3 occasions
Either through a Broken Wire in the Valve Block or one of those Valves getting blocked with rust or Crud, even though I change the Fluid every year
Where I have found myself Cruising along and then Suddenly and without Warning when I put on the Brakes
The Car took a Violent dive to the right and tried to ****** the Wheel out of my hand, where I felt very lucky not to be spun off the road
When the System was Brand New then no doubt it worked fine but 20 years of intense heat has made those wires go crispy, where maybe just a little jolt would be enough to break one
Or a build up of Crud in the Fluid could block up one of the Valves inside the Valve Block
Which doesn't tend to happen with a Vacuum Servo
Wait till you see the Photos of what I found when I took that ABS Pump apart, which I wasn't intending to do, as there are anti tamper locking tabs to prevent you from doing just that
But as 'Warrjon' said it could be done then I had to do it rather than be a 'Snowflake' and wimp out
As for the Vacuum Servo or Brake Booster as I call it, there is No Wiring up to do apart from the Brake Light Switch
Which taken in the Scheme of things is a minor inconvenience to wire up, being no more than just a couple of wires
And that is just about it, apart from from having to modify the Brake Pipes which looks a very easy job as I've made all the Brake Pipes on my Cars
Then there is just the Vacuum Tube to connect to the Inlet manifold and maybe an Aux Vacuum Tank to give you more capacity if needed
Where apart from anything else I'd like to make that Mod, as from my own personal viewpoint I feel that it is Safer and less likely to go wrong
As I've had the ABS go bad on 3 occasions
Either through a Broken Wire in the Valve Block or one of those Valves getting blocked with rust or Crud, even though I change the Fluid every year
Where I have found myself Cruising along and then Suddenly and without Warning when I put on the Brakes
The Car took a Violent dive to the right and tried to ****** the Wheel out of my hand, where I felt very lucky not to be spun off the road
When the System was Brand New then no doubt it worked fine but 20 years of intense heat has made those wires go crispy, where maybe just a little jolt would be enough to break one
Or a build up of Crud in the Fluid could block up one of the Valves inside the Valve Block
Which doesn't tend to happen with a Vacuum Servo
Last edited by orangeblossom; 05-15-2018 at 05:21 PM.
Thread
Thread Starter
Forum
Replies
Last Post
orangeblossom
XJS ( X27 )
16
05-14-2018 02:26 AM
Nos_Monkeys
XJ6 & XJ12 Series I, II & III
11
04-17-2013 05:20 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)