Rear wheel cylinders

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les
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Rear wheel cylinders

Postby les » Mon Jul 01, 2019 9:29 pm

Ive just replaced these cylinders, which normally I’ve bled quite easily. However I’ve still got air this time round. I sealed the pipes as soon as i disconnected them so feel the problem is limited to the rears, having not touched the front
I’ll bleed them again tomorrow, it might just need another attempt but I seem to recall a long lost post that mentions a procedure for bleeding rear cylinder, am I imagining this? I haven’t done anything special other times.


philthehill
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Re: Rear wheel cylinders

Postby philthehill » Mon Jul 01, 2019 10:13 pm

Les
In the past I have had to jack the rear of the car up really high so as to get the air out of the system. So high the cars were virtually standing on their noses. Helps to have a high lift jack.
Phil


les
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Re: Rear wheel cylinders

Postby les » Mon Jul 01, 2019 10:36 pm

Sounds like a plan, Phil , it make sense. I’ll do just that!


les
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Re: Rear wheel cylinders

Postby les » Tue Jul 02, 2019 11:30 pm

Just a follow up to conclude the thread, I jacked the rear up pretty high and pushed a quantity of fluid through the system, which ran clear. The pedal feels good now.


Nickol
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Re: Rear wheel cylinders

Postby Nickol » Wed Jul 03, 2019 2:49 am

For People who maybe as stupid as me - the rear brake bleed nipples are at the end of a brass extension, if i can call it that. It is imperative to tighten this up against the Banjo so that it is also vertical. It is very possible to have it in another Position such that bleeding the air out is a challenge.....

...but i expect this is known already......i found out the hard way
Gott schütze mich vorm Sturm und Wind und Autos, die aus England sind.
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les
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Re: Rear wheel cylinders

Postby les » Wed Jul 03, 2019 11:24 am

In that position it makes sense to fit little caps to keep the bleed nipples clear.


philthehill
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Re: Rear wheel cylinders

Postby philthehill » Wed Jul 03, 2019 11:30 am

Put those little caps over the ends of the grease nipples as well.


Trickydicky
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Re: Rear wheel cylinders

Postby Trickydicky » Wed Jul 03, 2019 3:01 pm

Hi les, I can remember you said you use sylicone brake fluid and have said this preserves the wheel cylinders. Can I ask why you needed to replace the rears?
Richard

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les
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Re: Rear wheel cylinders

Postby les » Wed Jul 03, 2019 6:53 pm

Well, I was having a general checking session, and on removing the nearside drum I thought the general area looked a bit damp. I deduced it was from a cylinder, so as good practice I bought a new one for each side. I am now wondering if my deduction was correct because during the renewal process I noticed a small puddle of oil on the floor just under the hub area, it came from the half shaft gasket. I still can’t be sure if this caused the damp appearance as with the drum and wheel off there is little to compress this gasket, so it may have been inevitable for oil to seep out.
I am indeed using silicone fluid and initially was surprised to think the seals were leaky. However as explained, I still cannot be certain as to the source of the damp but if I see further evidence I’ll conclude it was/is the gasket.



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