No brakes!!

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raynernick
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No brakes!!

Post by raynernick » Tue Feb 14, 2017 11:05 pm

Decided to give the old girl a run today.
Pushed out of garage to start - jumped in to stop the roll and NO BRAKES!

Both front callipers and rear pistons are new/ recon and done properly. There is ample brake fluid and no visible leaks on a quick inspection.
No pools where the car has been standing.
The fluid is not disappearing from the reservoir on pumping the pedal.
The pedal is straight to the floor with no resistance.
Car last ok on Dec19th

Would this point to the master cylinder?
How easy are the to replace and what one (girling) please?

Maybe you think the problem is something else?

Thanks Nick



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peter freeman
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Re: No brakes!!

Post by peter freeman » Tue Feb 14, 2017 11:19 pm

I think the repair kit might be SP 2134



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scimjim
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Re: No brakes!!

Post by scimjim » Tue Feb 14, 2017 11:24 pm

Definitely points to the MC if they're not pumping up and you're not losing fluid - total seizure of all 4 corners would be really bad luck!


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Re: No brakes!!

Post by BusaPhill » Tue Feb 14, 2017 11:33 pm

May be worth just undoing the master off the servo and seeing if there's brake fluid inside the servo.
May be a servo rebuild on the cards as well.


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Roger Pennington
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Re: No brakes!!

Post by Roger Pennington » Wed Feb 15, 2017 3:29 pm

BusaPhill wrote:May be worth just undoing the master off the servo and seeing if there's brake fluid inside the servo.
May be a servo rebuild on the cards as well.
Don't forget this is a Coupe, so unless it's been modified, it has a remote servo, the master cylinder isn't actually attached to the servo. Having said that, fluid could still be leaking from the servo cylinder into the body of the servo itself, and fluid could (I believe) leak out of the master and through the bulkhead to hide behind the carpets in the footwell. However in this case, Nick does say there's no visible loss of fluid, which I think tends to point to MC failure as per Jim's suggestion :)


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Re: No brakes!!

Post by raynernick » Wed Feb 15, 2017 10:15 pm

thank you everyone. I will have a good look over the next few days.
My coupe is unmodified.

Nick



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Coupe Racing
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Re: No brakes!!

Post by Coupe Racing » Thu Feb 16, 2017 7:05 pm

Roger Pennington wrote:
BusaPhill wrote:May be worth just undoing the master off the servo and seeing if there's brake fluid inside the servo.
May be a servo rebuild on the cards as well.
Don't forget this is a Coupe, so unless it's been modified, it has a remote servo, the master cylinder isn't actually attached to the servo. Having said that, fluid could still be leaking from the servo cylinder into the body of the servo itself, and fluid could (I believe) leak out of the master and through the bulkhead to hide behind the carpets in the footwell. However in this case, Nick does say there's no visible loss of fluid, which I think tends to point to MC failure as per Jim's suggestion :)

There is a sort of repeater master cylinder attached to a Girling Powerstop servo
Attachments
Servo Girling MKIIB.jpg
Servo Girling MKIIB.jpg (6.67 KiB) Viewed 1016 times


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Re: No brakes!!

Post by Roger Pennington » Thu Feb 16, 2017 7:36 pm

Yes, that's right - that's what I was referring to on the second line of my note :)


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Re: No brakes!!

Post by gordini5 » Thu Feb 16, 2017 7:56 pm

Glad to hear you discovered the problem at low speed. I've little knowledge of the master cylinder/servo workings so other than regular fluid and periodic filter changes, as a novice, is there any way of identifying any potential problems early or is it very unusual for them to fail suddenly like this? Mine is an early 5a.



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Coupe Racing
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Re: No brakes!!

Post by Coupe Racing » Thu Feb 16, 2017 9:09 pm

Roger Pennington wrote:Yes, that's right - that's what I was referring to on the second line of my note :)
I mis understood I thought you were referring to the one on the bulkhead


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Re: No brakes!!

Post by raynernick » Thu Feb 16, 2017 11:04 pm

I have a master cylinder on the way and will report back. Fairly sure the servo is ok.

Thanks
Nick



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Re: No brakes!!

Post by raynernick » Fri Feb 17, 2017 8:54 pm

Ok - I have the master cylinder. It looks an easy fit.
Is this the case or are there large "bewares" I should know.
Thanks
Nick



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Re: No brakes!!

Post by Coupe Racing » Fri Feb 17, 2017 9:06 pm

Hope it's the same bore size
Anyway bleeding the brakes needs a tip
Use a pressure bleeder , and the first thing to do is to crack each Union from the outlet of the bulkhead cylinder in turn until you reach the output pipe of the cylinder on the servo then bleed the brakes as normal


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Re: No brakes!!

Post by raynernick » Fri Feb 17, 2017 9:19 pm

Same bore size - Girling 0.875



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Re: No brakes!!

Post by rich001 » Fri Feb 17, 2017 11:40 pm

Brakes gone on mine, have been shunting it in and out the garage to do bits and bobs as garage is not very wide when my foot went right down to the floor, had to use the hand brake to stop me going off the drive and into the road. Was going to fit a new downpipe i bought from QRG but just reversed it straight back in. Stuff it lol Getting motor towed to my cousins garage for electrics to be sorted head gasket soldering, down pipe change and brake pipes sorting, oh for the love of cars.


72 SE5a

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