Series 2a - Brakes bind/lock

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Griffdowg

Griffdowg

New Member
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Somewhere in Bristol
Bit of an odd one :rolleyes:

All 4 of my brakes bind up together, but when you undo the bleed nipple it releases a bit of pressure from each wheel. The brakes then free up and work ok for 1-2 presses of the pedal but gradually get tighter and tighter until the wheels wont turn around (5-6 pedal presses). I was told it may be the flexi hoses so I replaced all 3 of these today and pressure bled the system through. I did read somewhere that it could be the master cylinder not set-up correctly. Does anybody know about this or can guide me? Its deff something hydraulic as it effects all 4 wheels.

My setup is a single reservoir with both brake and clutch master cylinders next to each other fed from this. I have been having problems with my clutch not depressing fully (all the time) so i think there may be a link. Is there any way the systems could effect each other? something to do with the reservoir?

Hmmmmmmmmmmmmmmm :doh:

G
 
I had similar experiences years back on my old S2 Griff.
If I remember correctly, there was adjustment via a threaded shaft with lock nut under an access plate somewhere at the lower end of my brake master cylinder accessible above the inner wing.
 
Thats what I read i think WP, but i dont fully understand it. Do you know which way up/down the shaft I need to adjust? and what am i trying to achieve by moving these nuts?

G
 
Yes, you need a bit of free pl;ay in the peddle before it starts working the hydrulics. Haven't got the book handy, but if the peddle will move about 1/4 inch with your fingers, it may be improved.
 
Cheers Davec, wealth of knowledge. I think i read that there is a port that allows the fluid to return through it and that if the shaft is not adjusted properly it can block this off... I may have all that wrong though :D will have a fiddle tomorrow eve and see what happens.

Do you think that this may also contribute to clutch hydraulic problems?

G
 
That sounds about right.
Not sure if it would affect the clutch, or even if the same applies to the clutch pweddle, but I don't like coincidendies, so trty itt and see.
 
just a thought, if your bleeding off the brakes to release the pressure could it be that the common reservoir drew some air in and thats whats causing the clutch problem??
 
doubt it. I used the 1 man pressure system :) works a treat. Will sort the brakes 1st and see how the clutch goes. may need to bleed that too. Doh! Slave is going to be a nightmare to get to with a V8 in the engine bay!
 
i ended up fitted a brake servo on my series 2a and a series 3 clutch master as well, being a fud i sheared the clutch slave cylinder bleed screw and i've never managed to get the clutch to work right since..... just to annoy me more whole clutch has seazed solid!!! your right enough on the access though, its bad enough with a 2 1/4 in!!!
 
If after pumping up the brakes so that they are binding, do the brakes slaken off after a few hours? I'm wandering if the pipe from the outlet of the master cylinder to the junction block has got crushed or has dirt trapped in it which is allowing oil to pass into the system but not letting it back out too well.
 
Hi Fenby,

Na, they are locked on until i undo the bleed nipples. Hopefully i can just adjust the MC i really dont want to replace it. Got to do the clutch MC and SC on the 90 before we go to the Alps in 3 weeks time to :( i think i have bitten off more than i can chew! Aw well ive not insured it yet, its got no MOT and its Tax exempt so im not loosing anything on it yet. IF its still in the garage in 12months time, im in trouble!

G
 
well it was the master cylinder that needed adjusting :D brakes are sorted now. Clutch is still a little iffy though. think it to may need adjusting. Do i do this again of the pushrod on the MC?

G
 
Ai, I will check the SIII manual tonight when i get home. May have to knock it all on the head soon though. think the springs are gone so wont be getting an MOT before i leave for the alps. So i might as well leave it until I get back in September. new post for springs :D

G
 
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