master cylinder fault

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martin418
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master cylinder fault

Postby martin418 » Fri May 17, 2019 9:41 am

hi i am sure its my master cylinder failing but i thought i would run it by the forum 1955 s2 fitted 8'' front brake otherwise std , 100 % perfect brakes last 4 years but last week left front started binding slightly i changed the brake hose but no luck now after bleeding both the fronts are binding unless i open a bleed nipple or leave it for about 1/2 an hour , rears seem ok the master cylinder has free play ,very good pedal pressure and bleeds out fine but i presume the return valve is the likely culprit , age of master unknown wheel cyls etc all fine

Murrayminor
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Re: master cylinder fault

Postby Murrayminor » Fri May 17, 2019 10:18 am

I have just read another thread where the owner was contemplating using a repair kit but has been talked out of it due to failing seals.
As the MS is located in a pig of a location if you have to change it you only want to be doing it once.
I cannot comment on your particular problem but having had my MS out twice I would definitely put a new one in if you need to and avoid the rebuild kits.
Proud owner of my first Morris Minor

martin418
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Re: master cylinder fault

Postby martin418 » Fri May 17, 2019 10:45 am

yes it will only be a good new one

paul 300358
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Re: master cylinder fault

Postby paul 300358 » Fri May 17, 2019 1:18 pm

Are you sure that the wheel cylinders are operating freely?

martin418
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Re: master cylinder fault

Postby martin418 » Fri May 17, 2019 2:30 pm

yes it definitely the master holding them on i just loosened the feed pipe to the front t union let the pressure go and the wheels spin free press pedal once and they are staying on , the piston in master returns fully and pedal has correct free play so i guess its the return valve


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