Brake Master Cylinder

Rickshaw · 12th November 2019, 18:25

This item has gone and my splendid 75 Diesel now failed it's MOT. The problem is that the garage cannot find anywhere to source these from ( I looked on Rimmer's and spoke to them - they did a search and could only find one in Greece! SO, does anyone have any idea where I might get one ?
I now believe a Brake Master Cylinder off an MG ZT will not do ?
Also ! does anyone know if a R75 v6 Saloon has same Brake Master Cylinder as a R75 V6 Tourer ?
Advice appreciated - have tried the Tech forum but zero response so far.
All the best

Mike Noc · 12th November 2019, 18:37

Contact Mickyboy on here I'm sure he will be able to help.

trikey · 12th November 2019, 19:43

All the same across the range except the 190, strange one this as I have never seen one fail!

Rickshaw · 12th November 2019, 21:35

Thanks Trikey - I rather thought these fails were rare. The main symptom was a continued , slow move of the brake pedal to the floor after the foot depression initially feeling ok(ish). I noticed a chap in 2016 on this club had almost the same fault. I have now managed to source two for my diesls off EBay but still need one as a spare for my 75 V6 Tourer.
Should add that my Diesel that failed the MOT on Brake Master Cylinder basis had been resting ( covered) on my driveway for 18months - although I can't see how that could have caused the failure? I regularly topped up the battery charge and turned it over too.
All the best.

RoverP480 · 12th November 2019, 21:41

Have you thought of sending it to a specialist to be rebuilt ?

DMGRS · 13th November 2019, 09:42

I had an email from a customer about these the other day (apologies if it was you, of course!)
It seems they're very reliable and rarely fail; thus I'd hunt one down from a relatively low mileage car being broken for spares.

In my search for suitable seals / pistons for rebuilding the plastic Clutch Master Cylinder many years ago I 'forcefully' disassembled one of these with around 150,000 miles on it - was like new inside, not even a 'tide mark' on the bore where the seals end travel. Very well built.

Mike Noc · 13th November 2019, 11:30

They should have got the brake master cylinder manufacturer to do the clutch hydraulics, and we might have ended up with something half decent.

clf · 13th November 2019, 11:36

Quote:

Originally Posted by Rickshaw

Thanks Trikey - I rather thought these fails were rare. The main symptom was a continued , slow move of the brake pedal to the floor after the foot depression initially feeling ok(ish). I noticed a chap in 2016 on this club had almost the same fault. I have now managed to source two for my diesls off EBay but still need one as a spare for my 75 V6 Tourer.
Should add that my Diesel that failed the MOT on Brake Master Cylinder basis had been resting ( covered) on my driveway for 18months - although I can't see how that could have caused the failure? I regularly topped up the battery charge and turned it over too.
All the best.

It is quite a common issue (or rather it was). Try searching for sinking pedal syndrome, if I recall. I believe someone posted a method of bleeding that eliminated the problem (may have been russ - but I cannot recall). It is not caused by the master cylinder being faulty.

Sent from my SM-A600FN using Tapatalk

DMGRS · 13th November 2019, 14:35

Quote:

Originally Posted by Mike Noc

They should have got the brake master cylinder manufacturer to do the clutch hydraulics, and we might have ended up with something half decent.

No arguments from me there!

350zwelgje · 13th November 2019, 16:35

Probably the garage checked this, if not there could perhaps be a simple fix:

Is the vacuum connection to the EGR valve ok? This rubber hose can perish or have holes due to 'chaving'. Vacuum is then lost and the brake master is not functioning at all.

If so, replace this hose and test if the brakes are normal again.
Had this twice and never had to replace the brake master on a diesel 75, although have a spare one on the shelf.

Rob

12th November 2019, 18:25	#1
Rickshaw Loves to post Rover 75 Tourer, 2 X75 Saloon , MGTF Sunstorm Join Date: Jan 2013 Location: Guildford Posts: 380 Thanks: 497 Thanked 172 Times in 93 Posts	Brake Master Cylinder This item has gone and my splendid 75 Diesel now failed it's MOT. The problem is that the garage cannot find anywhere to source these from ( I looked on Rimmer's and spoke to them - they did a search and could only find one in Greece! SO, does anyone have any idea where I might get one ? I now believe a Brake Master Cylinder off an MG ZT will not do ? Also ! does anyone know if a R75 v6 Saloon has same Brake Master Cylinder as a R75 V6 Tourer ? Advice appreciated - have tried the Tech forum but zero response so far. All the best

12th November 2019, 19:43	#3
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,760 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	All the same across the range except the 190, strange one this as I have never seen one fail! __________________ Lest we forget..

12th November 2019, 21:35	#4
Rickshaw Loves to post Rover 75 Tourer, 2 X75 Saloon , MGTF Sunstorm Join Date: Jan 2013 Location: Guildford Posts: 380 Thanks: 497 Thanked 172 Times in 93 Posts	Symptom Thanks Trikey - I rather thought these fails were rare. The main symptom was a continued , slow move of the brake pedal to the floor after the foot depression initially feeling ok(ish). I noticed a chap in 2016 on this club had almost the same fault. I have now managed to source two for my diesls off EBay but still need one as a spare for my 75 V6 Tourer. Should add that my Diesel that failed the MOT on Brake Master Cylinder basis had been resting ( covered) on my driveway for 18months - although I can't see how that could have caused the failure? I regularly topped up the battery charge and turned it over too. All the best. Last edited by Rickshaw; 12th November 2019 at 21:43.. Reason: Thought of extra info for people to read

13th November 2019, 09:42	#6
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	I had an email from a customer about these the other day (apologies if it was you, of course!) It seems they're very reliable and rarely fail; thus I'd hunt one down from a relatively low mileage car being broken for spares. In my search for suitable seals / pistons for rebuilding the plastic Clutch Master Cylinder many years ago I 'forcefully' disassembled one of these with around 150,000 miles on it - was like new inside, not even a 'tide mark' on the bore where the seals end travel. Very well built. __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

13th November 2019, 16:35	#10
350zwelgje Avid contributor 75 KV6 2.5 3x Rover 75 CDT Join Date: Jan 2011 Location: Belgium Posts: 249 Thanks: 6 Thanked 34 Times in 33 Posts	Probably the garage checked this, if not there could perhaps be a simple fix: Is the vacuum connection to the EGR valve ok? This rubber hose can perish or have holes due to 'chaving'. Vacuum is then lost and the brake master is not functioning at all. If so, replace this hose and test if the brakes are normal again. Had this twice and never had to replace the brake master on a diesel 75, although have a spare one on the shelf. Rob __________________ 75 KV6 2.5 Sterling automatic, 3x 75 CDT (2 manual + automatic), MG ZT 190+, 620i, SD1 2300S, P6 2000SC & TVR 350i

12th November 2019, 18:37	#2
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,547 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Contact Mickyboy on here I'm sure he will be able to help.

12th November 2019, 21:41	#5
RoverP480 Gets stuck in None at the moment Join Date: Jan 2018 Location: Hereford Posts: 501 Thanks: 1 Thanked 165 Times in 146 Posts	Have you thought of sending it to a specialist to be rebuilt ?

13th November 2019, 11:30	#7
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,547 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	They should have got the brake master cylinder manufacturer to do the clutch hydraulics, and we might have ended up with something half decent.

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