Just changed rear disks and pads on my Xantia. Had to take calipers off to free the inner pads, what a mess. All finished, just need to bleed the brakes.. Front caliper are fine, lots of LHM, no bubles, but I cant seem to get any LHM flowing to the rear calipers.. What am I doing wrong ?? Back end on axel stand front end on ramps..
I must be missing somthing simple.. Please help !
Trouble bleeding rear calipers on Xantia
Moderator: RichardW
-
OnlineMandrake
- Posts: 8614
- Joined: 10 Apr 2005, 17:23
- Location: North Lanarkshire, UK
- My Cars:
- x 664
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by RichardW</i>
For reasons I don't fully understand if you have the rear hanging free and let the suspension pressure off, it doesn't repressure until you get some weight rear suspension - even with the lever on high. Had that problem when I was rebuilding the rear brakes on my previous Xantia.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
It's easy to explain - with the car on axle stands and both wheels hanging down, the link from the rollbar via a spring to the height corrector is trying to move the height corrector in the direction that will RELEASE pressure, while the manual height control lever via another spring is trying to force the height corrector in the opposite direction to INPUT pressure to the suspension.
Whichever spring is stronger will win. In theory it should be adjusted such that the manual height lever wins out, but that seems not to be the case on many cars.
The answer is simple as per my previous post - set the height lever to high, only jack up ONE side of the car at a time, leaving the other rear wheel fitted and on the ground with no axle stand.
The weight of the car resting on the wheel still on the ground ensures that if the arm is fully extended there must be pressure there holding the car up (otherwise the back would be down) and even if the height corrector closes, you have full pressure backed up by the suspension spheres and the weight of the car to push the oil out the bleed valve...
Guarenteed to work every time. [:D]
Regards,
Simon
For reasons I don't fully understand if you have the rear hanging free and let the suspension pressure off, it doesn't repressure until you get some weight rear suspension - even with the lever on high. Had that problem when I was rebuilding the rear brakes on my previous Xantia.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
It's easy to explain - with the car on axle stands and both wheels hanging down, the link from the rollbar via a spring to the height corrector is trying to move the height corrector in the direction that will RELEASE pressure, while the manual height control lever via another spring is trying to force the height corrector in the opposite direction to INPUT pressure to the suspension.
Whichever spring is stronger will win. In theory it should be adjusted such that the manual height lever wins out, but that seems not to be the case on many cars.
The answer is simple as per my previous post - set the height lever to high, only jack up ONE side of the car at a time, leaving the other rear wheel fitted and on the ground with no axle stand.
The weight of the car resting on the wheel still on the ground ensures that if the arm is fully extended there must be pressure there holding the car up (otherwise the back would be down) and even if the height corrector closes, you have full pressure backed up by the suspension spheres and the weight of the car to push the oil out the bleed valve...
Guarenteed to work every time. [:D]
Regards,
Simon
when car on axle stands and both rear wheels off,put hight lever to high,then use a trolly jack with a piece of wood across from calliper to hub of brake disc and,with engine running gently jack up the arm,as soon as you feel susp pushing down on jack let jack off a bit at a time until rear susp is fully pumped up,mind you dont tip car over as susp presure biulds up,then you should be able to bleed brackes
regards malcolm
regards malcolm
-
- Posts: 57
- Joined: 20 Aug 2005, 20:37
- Location: Marshfield UK
- My Cars: