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8 & 10 cyl Bristol cars From Type 407 onwards

411 brake problems

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Old 05-01-18, 09:30 AM
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Location: woodhouse australia
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Default 411 brake problems

I am having trouble with my brakes. I have reconditioned the calipers and checked or replaced the flexible lines. Every so often the brakes lock on and wont release . The only way I can get the car to move is to release the pressure in the lines by loosening the brake lines at the master cylinder. I suspect this will be a Master Cylinder problem.

Question 1 has any one experienced the same thing.

Question 2 Does any one know the availability of a replacement cylinder ( I believe Mk 1 & Mk 2 are different to later cars)

I also need inner and outer tie rod ends

Regards Peter Dowdle
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Old 05-01-18, 12:10 PM
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Hi Peter,
I am not at all familiar with a 411 master cylinder or any variations of it, however I have experienced the problem you described on two separate instances. ( not in a Bristol)

The first situation required overhauling the master cylinder, I suspected that the bleed valve in the cylinder was not operating correctly. It worked fine afterwards.

The second situation was the activating rod between the pedal and the master cylinder piston had a /lengthening/shortening adjustment by way of a threaded section into a coupling connecting to the pedal. This provided an amount of free play between the piston and the pedal ( much like the need for valve/tappet clearance) - but in this case not much, maybe 1/4 inch, just enough for the piston to return freely into its neutral position and not be restricted thus allowing the brake fluid to return without a resisting pressure, which if pressure was there would build up and eventually lock the brakes, as if you had your foot on the pedal.

The second situation was also very quickly fixed by way of loosening the bolts holding the master cylinder to the firewall because the adjusting coupling was very difficult to get to, at night in the middle of no-where.

Hope the above is of some help even though it was not in a Bristol but in a Chrysler/Mitsubishi.

Cheers
Pete
Ps. What type of accommodation do you want at Mildura :-)
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Old 05-01-18, 06:38 PM
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Peter,
Rare for servo's to fail, but having said that I recently had to replace one on a Skoda (VAG group). The symptoms were that the front brakes would stick on after repeated applications of the brake pedal and would only release after leaving it for some time or, like you, letting the pressure out from the hydraulic line.
Has the 411 got two servo's like my 412, or just a single?
One problem which can occur is that the vacuum chamber can fill with water or petrol over time (condensation). You can sometimes correct this by draining the chamber (means taking it off), but if it has got petrol in it this may have rotted the seals.
Repair kits for some servo's are available, see for example NORTHWEST AUTOMOTIVE HYDRAULIC COMPONENTS

This site has copies of catalogues which you can download.


Good luck

John P
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Old 05-01-18, 07:56 PM
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Default thanks

Thanks guys I forgot to mention I have 2 new boosters and I have checked freeplay on the rod.

most likely to be the bleedback on the master cylinder

Series 1 & 2 have a single cylinder but dual system .Bristol years ago used to carry stock of repair kits but are nearly 50 years old and don't last. Series 3 4 & 5 have a different cylinder as best I can gather and im sure could be adapted. Does any one know what other cars either of the cylinders are common too.

Any clue on tie rod ends
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Old 05-01-18, 08:50 PM
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The series 3 uses the same master cylinder as the Range Rover of that period and I think the same unit was used on the series 4 and 5, 412 and 603.
Geoff.
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Old 06-01-18, 04:47 AM
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thanks for that Geoff
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Old 13-01-18, 11:15 AM
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The tie rod ends are relatively easily sourced once you know that they were also used on the Austin Healy 3000. But you'll need to work out whether you need LH or RH threads
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Old 13-01-18, 12:01 PM
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Re my earlier post. Now I'm confused, I know what I told you re Healy track rod ends is correct for a 410, but I now note that Amsteer - see. You are being redirected...
list a separate rod end for the 411, for quite a lot more money.

They probably know best
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Old 13-01-18, 09:11 PM
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Default Brakes coming on

Check any breather on the master cylinder. On the 409, the brake fluid level cap was replaced by plain pug- no breather. When brakes got warm, fluid expanded and calipers came on. just a thought
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Old 13-01-18, 11:43 PM
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Default Ball joints

Amsteer will make you track rod ends to pattern. They made me a couple for my 412 some years ago. Very helpful Company (then).
John P
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