Hey guys. I have an LC S model.
It had 4 wheel drums when I got it, but I got my hands on a wrecked LJ and used the front discs off that and put them on my LC (well, my mechanic did it).
No booster was fitted.
I have an XU-1 booster and was wanting to fit this to my car.
Can it be easily done? What other parts will I require?
My mechanic has never done it before so he said if I can give him all the parts and a rough guide on how to do it, he will have a crack at it for me.
Any help is appreciated.
Thanks
Dane
Fitting a brake booster to non-boosted cars
Started by
_Gib Sandwich_
, Jul 31 2006 02:46 PM
16 replies to this topic
#2
makka
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Posted 31 July 2006 - 03:59 PM
I had to do this to my LH, as it was 4 wheel drum. all I needed to do was drill some holes in the fire wall and mount the booster ect from my other car, including the pushrod. I havnt seen the setup for a non boosted LC, does the m/c bolt directly to teh firewall or is it on a bracket like the booster would be?
Pics?
Pics?
#3
limo
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Posted 31 July 2006 - 04:18 PM
You need the bracket to mount booster onto firewall with bellcrank fitting. Did your mechanic use same M/C from the drum brakes? if so did he change flow valve in front cct?
There is also support bar that bolts to guard inner.
There is also support bar that bolts to guard inner.
#4
dattoman
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Posted 01 August 2006 - 12:54 AM
Don't forget to change the rear wheel cylinders and shoes to suit the disc setup
N1132 shoes
P5573 wheel cylinders
Fit inside your original drums
N1132 shoes
P5573 wheel cylinders
Fit inside your original drums
#5
_Gib Sandwich_
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Posted 02 August 2006 - 11:10 AM
As far as I understand, all he did was take off the drums and the stub axles and press the new stub axles with discs on.
I assume he used the same master cylinder?
It was a while back now.
As for the bracket to hold the booster to the firewall, I have the one that comes on an LJ which has the normal booster for that car, will the XU-1 booster go straight onto this? What is a "bellcrank fitting"? The master cylinder bolts directly to the firewall
I guess I could probably buy the support bar from rare spares or something?
As for changing the flow valve I have no idea, but I have noticed the rear brakes seem to lock up easily?
Any other input?
Cheers guys...
I assume he used the same master cylinder?
It was a while back now.
As for the bracket to hold the booster to the firewall, I have the one that comes on an LJ which has the normal booster for that car, will the XU-1 booster go straight onto this? What is a "bellcrank fitting"? The master cylinder bolts directly to the firewall
I guess I could probably buy the support bar from rare spares or something?
As for changing the flow valve I have no idea, but I have noticed the rear brakes seem to lock up easily?
Any other input?
Cheers guys...
#6
Dr Terry
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Posted 02 August 2006 - 12:12 PM
Hi Gib Sandwich.
As dattoman said, you must change the rear cylinders & shoes, this will resolve the lockup problem.
The 'bellcrank fitting' is the relay lever & bracket system that the LC/LJ boosters use to mount & operate. Your booster is not mounted directly to the firewall (like an HQ or LH), it will have a bracket etc. between the booster & firewall. The reason they use a bellcrank arrangement is that the pedal is much lower than the booster & 'pulls' on a rocking lever, the pedal does not push directly on to the booster's pushrod.
If the same master cylinder is used when you convert to front discs, the calipers will not fully release & you will have severe pad wear. You have to, at least, remove the residual pressure valve from the front pipe fitting.
What do you mean by support bar ? There is a stiffening bracket that goes to the inner guard that should come with the booster. If you haven't got one, search the wreckers or make one, it's only a bar with a hole at each end.
Dr Terry.
As dattoman said, you must change the rear cylinders & shoes, this will resolve the lockup problem.
The 'bellcrank fitting' is the relay lever & bracket system that the LC/LJ boosters use to mount & operate. Your booster is not mounted directly to the firewall (like an HQ or LH), it will have a bracket etc. between the booster & firewall. The reason they use a bellcrank arrangement is that the pedal is much lower than the booster & 'pulls' on a rocking lever, the pedal does not push directly on to the booster's pushrod.
If the same master cylinder is used when you convert to front discs, the calipers will not fully release & you will have severe pad wear. You have to, at least, remove the residual pressure valve from the front pipe fitting.
What do you mean by support bar ? There is a stiffening bracket that goes to the inner guard that should come with the booster. If you haven't got one, search the wreckers or make one, it's only a bar with a hole at each end.
Dr Terry.
#7
dattoman
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Posted 02 August 2006 - 10:01 PM
This bracket with "bellcrank"
And yes the XU1 booster will bolt straight on
Just make sure you use the correct master cylinder to suit it
And yes the XU1 booster will bolt straight on
Just make sure you use the correct master cylinder to suit it
#8
_73lj202_
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Posted 03 August 2006 - 10:31 AM
As mentioned above, but the size of the rear wheel cylinders on a drum brake frt end are larger than disc ones, so you'll have a crap pedal feel & to much travel not so much lock up..Hi Gib Sandwich.
As dattoman said, you must change the rear cylinders & shoes, this will resolve the lockup problem.
Dr Terry.
#9
_Gib Sandwich_
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Posted 03 August 2006 - 01:15 PM
Hrmm I am fairly sure that I do not have that bracket....
I am fairly sure that it does bolt directly to the firewall.
I will have to take some pictures of this.
I am fairly certain that the XU-1 booster has the master cylinder, but I think I would like to get it all reconditioned before I use it, how much can I expect to pay to have this done?
Cheers guys.
Dane
I am fairly sure that it does bolt directly to the firewall.
I will have to take some pictures of this.
I am fairly certain that the XU-1 booster has the master cylinder, but I think I would like to get it all reconditioned before I use it, how much can I expect to pay to have this done?
Cheers guys.
Dane
#10
Dr Terry
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Posted 03 August 2006 - 01:25 PM
Hi Guys.
No, 73lj202, that is not correct, the rear cylinders on a front disc car are only 9/16" in diameter.
Dr Terry
No, 73lj202, that is not correct, the rear cylinders on a front disc car are only 9/16" in diameter.
Dr Terry
#11
dattoman
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Posted 04 August 2006 - 01:20 AM
If you have a booster on the car now you have a bracket
There is no room for a booster without it
So the XU1 one will bolt straight on
There is no room for a booster without it
So the XU1 one will bolt straight on
#12
_73lj202_
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Posted 04 August 2006 - 08:07 AM
Sorry terry, But you may be correct ,I'll recheck. my info...I know I swapped the cylinders/shoes when I did the conversion 24 years ago! but I could be wrong,perhaps it was smaller to larger and the travel/pedal feel was better! i guess when I worked at PBR it was easier to remember!Hi Guys.
No, 73lj202, that is not correct, the rear cylinders on a front disc car are only 9/16" in diameter.
Dr Terry
Edited by 73lj202, 04 August 2006 - 08:15 AM.
#13
dattoman
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Posted 04 August 2006 - 09:43 PM
Orig drum cylinders are larger
Disc version are 9/16"
Reduces lock up and requires less fluid to work ..... so higher pedal feel (however mostly negated by the larger caliper piston size)
Disc version are 9/16"
Reduces lock up and requires less fluid to work ..... so higher pedal feel (however mostly negated by the larger caliper piston size)
#14
_Gib Sandwich_
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Posted 07 August 2006 - 01:40 PM
Nah mate, my car is non boosted, I am trying to put a booster on a car that had no booster at all.If you have a booster on the car now you have a bracket
There is no room for a booster without it
So the XU1 one will bolt straight on
#15
dattoman
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Posted 08 August 2006 - 12:11 AM
You need a cantilever bracket then
#16
_73lj202_
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Posted 25 August 2006 - 10:02 PM
Hi Guys.Hi Guys.
No, 73lj202, that is not correct, the rear cylinders on a front disc car are only 9/16" in diameter.
Dr Terry
Yes Terry it is correct, rear wheel cylinders on a drum brake Front end are larger than rear wheel cylinders on a disc brake frt end, On a 4 wheel drum set-up, the rear wheel cylinders are 20.64mm on a disc frt set up rear wheel cylinders are 14.28mm. We may be confusing one another when the term lock up came up, I was referring to the rears locking up, whereas I believe you are refferring to frts locking up?
73LJ202
#17
_Gib Sandwich_
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Posted 27 August 2006 - 03:10 PM
Nah mate I was talking about the rears. Had someone cut in front of me (i.e. change into my lane) unfortunately I happened to be inside the space in that lane that he was trying to merge into.
Slammed on the brakes, rears locked up, causing my car to pretty much be completely sideways across the road as I also had to turn to the side to avoid being hit.
Some people
Slammed on the brakes, rears locked up, causing my car to pretty much be completely sideways across the road as I also had to turn to the side to avoid being hit.
Some people
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