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29th January 2019, 15:37 | #51 | |
Gets stuck in
Rover 75 Connie SE 2.5 V6 Auto Join Date: Aug 2015
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Sounds good .... really appreciate the advice.. I think I'll start Plus-Gassing my nipples in anticipation of some warmer months to come. Not sure if that sentence will get past the naughty word monitor but it's an honest statement! Thanks again Brian John
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29th January 2019, 18:10 | #52 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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If you look at the ABS modulator's flow diagram for any wheel, brake fluid from the master cylinder flows through the inlet solenoid valve (normally open) and thence to the caliper. 'Normally open' means that the default state of this valve, i.e. with no electric current applied to it, is that brake fluid is free to pass through it unhindered. The outlet solenoid valves (also in the caliper circuit) are 'normally closed' so no fluid or air can pass through them unless a wheel sensor activates the ABS (which would not be the case when renewing fluid or replacing failed external pipework). So what we effectively have is simply a length of pipe from master cylinder directly to the caliper. That's it, and this applies to all wheels. It has to be like this because the ABS is a fail-safe system. So if the ABS has not been activated there is no possibility of air entering any part which requires T4 to remove it. I haven't found any reference to turning on the ignition activating any valves internal to the ABS modulator for testing purposes. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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29th January 2019, 18:21 | #53 | |
This is my second home
Rover 75CDT, Jaguar XF-S 3.0V6, V'xhall Omega V6 Estate, Twintop 1.8VVT, Astra Estate and Corsa 1.2 Join Date: Dec 2007
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I was tempted, Simon, but in the end found it too stressful so just could not bring myself to do it! Addendum - following overnight reflection, the information is too useful not to acknowledge and on the whole he is a nice man. So done. Last edited by MSS; 30th January 2019 at 08:24.. |
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29th January 2019, 19:13 | #54 | |
This is my second home
R75 Saloon. Join Date: Feb 2009
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I can remember bleeding the brakes that way more than 50 years ago but have since got out of that habit.--- |
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29th January 2019, 19:13 | #55 | |
MG ZT Join Date: Jan 2011
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If a "fault condition" occurs, such as failure of one of the primary circuits, the associated shuttle valve will operate to minimise fluid loss, and the ABS ECU will determine an open bleed nipple and loss of pressure on any of the two primary circuits as a fault condition. This can result in air being trapped in either accumulator which requires a secondary bleed using T4, the symptom of air trapped in this area is commonly described as sinking pedal syndrome. So the safest course of action is not to have the ignition turned on while any of the hydraulic circuits are open, as to have no possibility of either of the shutoff valves operating, and simply isn't necessary under any circumstance. Brian |
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29th January 2019, 19:17 | #56 | |
This is my second home
R75 Saloon. Join Date: Feb 2009
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29th January 2019, 22:13 | #57 |
MG ZT Join Date: Jan 2011
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I've never investigated the other cars I own with ABS braking, the only others are the Freelander with a WABCO system, and the 416 tourer with.....well your guess is as good as mine
I shall take a look see when I get a chance, as I do have a Microcheck Brian |
29th January 2019, 23:40 | #58 |
Posted a thing or two
Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016
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Thanks for all the replies! quite a mixed bag of answers
I guess I will have a go at the gravity way of doing it as suggested. however, I will wait until the middle of summer. Way too cold at the moment.
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30th January 2019, 07:58 | #59 | |
Doesn't do things by halves
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It should therefore not be concluded that this brief operation of the return pump requires the use of T4 in any subsequent bleeding operation. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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30th January 2019, 08:08 | #60 | ||
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Brian Last edited by marinabrian; 30th January 2019 at 08:13.. Reason: Spelling |
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