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Old 7th April 2022, 17:42   #11
dave lincs
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I think I would be getting someone else to look at your car as it burst a brake pipe so brakes must have been working to burst the pipe? Now cant bleed any of the system very strange, if it has run out of fluid it will need to go on a T4 as well to bleed ABS module
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Old 7th April 2022, 19:45   #12
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Originally Posted by dave lincs View Post
... if it has run out of fluid it will need to go on a T4 as well to bleed ABS module
This was not my experience.

When my brake lines from front to rear burst due to corrosion my master cylinder repeatedly emptied during a journey. I replaced the defective pipe runs and successfully bled the system with nothing more than Easi Bleed.

Reading RAVE shows that the ABS module would only need bleeding using T4 if ABS braking was activated during the brake fluid leak or if the ignition was switched on during the traditional bleeding process (which would be unnecessary anyway). The reason for this is that under normal braking the only active components are the master cylinder, the pipework and the calipers.

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Last edited by SD1too; 7th April 2022 at 20:43..
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Old 8th April 2022, 08:17   #13
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Originally Posted by SD1too View Post
This was not my experience.

When my brake lines from front to rear burst due to corrosion my master cylinder repeatedly emptied during a journey. I replaced the defective pipe runs and successfully bled the system with nothing more than Easi Bleed.

Reading RAVE shows that the ABS module would only need bleeding using T4 if ABS braking was activated during the brake fluid leak or if the ignition was switched on during the traditional bleeding process (which would be unnecessary anyway). The reason for this is that under normal braking the only active components are the master cylinder, the pipework and the calipers.

Simon
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Yet again you are preaching from Rave to bleed the system properly you do need T4 or other suitable equipment to run the abs module there is a thread about this by bigruss if you read it then it might give you some more crucial information about bleeding brakes

Dave
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Old 8th April 2022, 08:37   #14
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Quote:
Originally Posted by SD1too View Post
This was not my experience.

When my brake lines from front to rear burst due to corrosion my master cylinder repeatedly emptied during a journey. I replaced the defective pipe runs and successfully bled the system with nothing more than Easi Bleed.

Reading RAVE shows that the ABS module would only need bleeding using T4 if ABS braking was activated during the brake fluid leak or if the ignition was switched on during the traditional bleeding process (which would be unnecessary anyway). The reason for this is that under normal braking the only active components are the master cylinder, the pipework and the calipers.

Simon
This is you're experience (1x failed brake pipe on you're own car).
Firstly never had a pipe fail on my own car, always changed them when noticed by myself or a mot tester.
As you said you topped up you're reseviour several times, you didn't run you're system dry. Had you done do you would have experienced, like others the need for a t4 or pscan to run the abs modulator to purge the system of air. Why suggest then the mechanic is at fault and the repair cost is on him, just because it isn't the same as the one senario you encountered?

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Old 8th April 2022, 09:37   #15
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Originally Posted by dave lincs View Post
Simon

Yet again you are preaching from Rave to bleed the system properly you do need T4 or other suitable equipment to run the abs module there is a thread about this by bigruss if you read it then it might give you some more crucial information about bleeding brakes

Dave
Is this the thread you are referring to Dave? https://www.the75andztclub.co.uk/for...ad.php?t=63314
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Old 8th April 2022, 09:44   #16
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Quote:
Originally Posted by shiner View Post
This is you're experience (1x failed brake pipe on you're own car).
Firstly never had a pipe fail on my own car, always changed them when noticed by myself or a mot tester.
As you said you topped up you're reseviour several times, you didn't run you're system dry. Had you done do you would have experienced, like others the need for a t4 or pscan to run the abs modulator to purge the system of air. Why suggest then the mechanic is at fault and the repair cost is on him, just because it isn't the same as the one senario you encountered?

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Because he undertook to do a job and is unable to complete the job !


It's certainly not the customers fault, nor should the customer be expected to find a solution.
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Old 8th April 2022, 10:32   #17
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... you didn't run you're system dry. Had you done do you would have experienced, like others the need for a t4 or pscan to run the abs modulator to purge the system of air. k
Hello Andy,

Whether the braking system is run dry or not is actually irrelevant.

In normal braking mode (ABS modulator inactive) "... fluid from the master cylinder assembly flows through the open ... inlet solenoid valves to operate the brakes." (RAVE 70-21) It really is as simple as that.

As the ABS modulator has not operated no air can be drawn into the accumulator/pump assembly. It is therefore unnecessary to run the modulator to remove air that isn't there. Any air present in the modulator's pipework and open inlet solenoid valve will be purged by conventional bleeding methods. This is illustrated clearly in the modulator schematics in RAVE 70-19 (non-ETC) and 70-20 (ETC).

The MG Rover instructions for bleeding the brakes (Service procedures 70-4) describe the conventional method. There is absolutely no mention of mandatory or optional use of Testbook.

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Last edited by SD1too; 8th April 2022 at 10:40..
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Old 8th April 2022, 10:50   #18
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... you do need T4 or other suitable equipment to run the abs module there is a thread about this by bigruss ...
Quote:
Originally Posted by stevestrat View Post
Is this the thread you are referring to Dave? https://www.the75andztclub.co.uk/for...ad.php?t=63314
Thank you Steve for the link. I have read Russ' post. He describes a bleeding operation where one circuit was free of air and the other wasn't. Downstream of the master cylinder both these circuits are identical. He chose to use T4 giving his opinion that this is the "proper" way to do it. The fact that the brakes are the dual circuit type has no bearing upon using T4.

Russ' claim in his penultimate paragraph that diagnostic equipment must be used to bleed the secondary circuit is incorrect, neither is it mentioned in MGR's service procedures.

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Last edited by SD1too; 8th April 2022 at 10:53..
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Old 8th April 2022, 11:19   #19
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Is this the thread you are referring to Dave? https://www.the75andztclub.co.uk/for...ad.php?t=63314
Steve yes that's the one
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Old 8th April 2022, 11:46   #20
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I had this problem when I changed two rear brake pipes in that air wouldn't come out of the system on one of my ZT's.
All I did was gravity method, left the nipple open and let gravity do the work, took a little longer but cleared all the air out, repeated the other side and repeatedly topped it up until needed.

Works every time for me even on other cars when I change brake pipes.
I completely changed all pipes on my Montego and left one nipple at a time open on the correct side at a time and that also worked.
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