Brake fault on Rover 75 CDTi 2003

[RodgerD]

Originally Posted by andrewinpopayan

Old BL thing, you have to bleed both fronts AND both rears at the same time. First came out on the "Metro" in early 80's.

Metro's didn't have anti-lock brakes and the complexities that can occur. Bleeding the brakes on a 75 doesn't involve bleeding both front and rears at the same time; there is a set down procedure. I suspect the problem is in the ABS unit if you aren't getting any fluid through, you might need the services of a T4 to actuate the ABS module or diagnose why there is a problem.

Order is for a RHD car, rear passenger, rear drivers, front passenger, front drivers. Information from Rave. Only partial bleeding can be achived without a T4.

Preamble in Rave regarding bleeding brakes: The following procedure covers bleeding the complete system, but only where only the primary or secondary circuit has been disturbed in isolation ir should only be necessary to bleed that circuit. Partial bleeding of the hydraulics is only permissible if a brake pipe or hose has been disconnected with only minor lose of fluid.

[T-Cut]

Anyone know where is the reference to T4 in the RAVE brake bleeding procedure? I've looked hard, but never found it. Even replacing and bleeding the ABS unit makes no mention of it.

TC

[SD1too]

Originally Posted by Nobbler

Have not tried bleeding the rear brakes yet ... wondering if its a dual system maybe the air lock needs to be bleed from the rear, will give it a go tomorrow.

Colin,

RAVE's recommended sequence is as follows:

1. NSR caliper first. Apply pressure to brake pedal several times then apply steady pressure. Loosen bleed screw. Allow pedal to return unassisted. Depress pedal steadily and allow to return unassisted. Repeat until all air is purged then, whilst holding pedal at end of downward stroke, tighten bleed screw.
2. Repeat at OSR.
3. Repeat at NSF.
4. Repeat at OSF.

Note that there is no mention of T4.

A pressure bleeding system such as Gunson's Easibleed makes the whole process much .... well ... easier!

Simon

[Nobbler]

Thanks for the info, how the hell do you bleed both the front brakes at the same time it sounds like a 3 man job, will get the info on duel brake circuits.

[RodgerD]

Originally Posted by SD1too

Colin,

RAVE's recommended sequence is as follows:

1. NSR caliper first. Apply pressure to brake pedal several times then apply steady pressure. Loosen bleed screw. Allow pedal to return unassisted. Depress pedal steadily and allow to return unassisted. Repeat until all air is purged then, whilst holding pedal at end of downward stroke, tighten bleed screw.
2. Repeat at OSR.
3. Repeat at NSF.
4. Repeat at OSF.

Note that there is no mention of T4.

A pressure bleeding system such as Gunson's Easibleed makes the whole process much .... well ... easier!

Simon

Rave works hand-in-hand with a T4 as both are dealer only items. It isn't mentioned in Rave as mechanics when trained would have been advised that bleeding 75 brakes would need to be done with a T4 (Rave isn't a training manual, just workshop information). T4 has the required sub-routine and if I remember correct an explanation of why the modulator valves need to be open when the brakes are bleed. I assume Simon that you've not had access to a T4 and wouldn't have that sort of knowledge. Here's a thread started by Big Russ, who as you know has a T4 and decided to bleed the brakes with the help of a T4, with dramatic results. http://www.the75andztclub.co.uk/foru...ad.php?t=63314

As I published, Rave does say you can only do a partial bleed: The following procedure covers bleeding the complete system, but only where only the primary or secondary circuit has been disturbed in isolation it should only be necessary to bleed that circuit. Partial bleeding of the hydraulics is only permissible if a brake pipe or hose has been disconnected with only minor lose of fluid. To do a FULL bleed you do need to open the modulator valves in the ABS unit with either a T4 or some other system.


As I have said, I suspect the OP's problem is within the ABS unit, and the modulator valves need opening to ensure ALL the air is excluded from the system.

Andy (Shiner) has access to a T4, so my suggestion is the OP gets in contact with him.

[RodgerD]

Originally Posted by Nobbler

Thanks for the info, how the hell do you bleed both the front brakes at the same time it sounds like a 3 man job, will get the info on duel brake circuits.

Sorry IMO that's a red herring, get in touch with Andy (Shiner) who has access to a T4, is a good mechanic and with the aid of a T4 can either fully bleed your brakes or diagnose if you have a problem within the ABS unit. Having no brake fluid coming out of one caliper is strange, so needs more intensive investigation.

[Mike Noc]

Originally Posted by SD1too

Colin,

RAVE's recommended sequence is as follows:

1. NSR caliper first. Apply pressure to brake pedal several times then apply steady pressure. Loosen bleed screw. Allow pedal to return unassisted. Depress pedal steadily and allow to return unassisted. Repeat until all air is purged then, whilst holding pedal at end of downward stroke, tighten bleed screw.
2. Repeat at OSR.
3. Repeat at NSF.
4. Repeat at OSF.

Note that there is no mention of T4.

T4 is mentioned in RAVE when you change the ABS modulator though Simon:

Refit.....
13. Bleed brakes.
+BRAKES, ADJUSTMENTS, Brake
bleed.
14. To ensure correct operation, the ABS system
MUST be tested using TestBook.





.

[andrewinpopayan]

Originally Posted by RodgerD

Sorry IMO that's a red herring, get in touch with Andy (Shiner) who has access to a T4, is a good mechanic and with the aid of a T4 can either fully bleed your brakes or diagnose if you have a problem within the ABS unit. Having no brake fluid coming out of one caliper is strange, so needs more intensive investigation.

The reason no fluid is coming out of that caliper is because the pressure differential valve has closed off that part of the circuit because it thinks that it has a leak. So to make fluid come out, you MUST open the other side to equalise the pressure.

[David Lawrence]

Originally Posted by Mike Noc

T4 is mentioned in RAVE when you change the ABS modulator though Simon:

Refit.....
13. Bleed brakes.
+BRAKES, ADJUSTMENTS, Brake
bleed.
14. To ensure correct operation, the ABS system
MUST be tested using TestBook.





.

Are you looking at page 79-29? Because mine only goes up to number 8. Connect testbook to clear fault codes.


I dont have a 14. Is this a later change or is it covered in another section?

[Mike Noc]

It's the RAVE for the Freelander David. Strange if they only put it in some manuals and not others.