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I still think you should change the master when all else is adjusted.
The pedal should hit the brakes in much the same spot every time, the position should feel familiar every time.

If the master cylinder is knackered, it does not matter how many times you bleed the brakes, air will be getting in via the master cylinder.
For that small cost to replace it, you then have everything renewed. At the moment you will just be chasing your tail, using endless brake fluid, because air is still getting in the system. The Master Cylinder is the heart of the brake system, if that is not working correctly how can you expect the other bits to do so?

If you're ditching your master cylinder, take the opportunity and go dual circuit.

Very sound advice indeed.

I've already bought a new master cylinder at a princely cost of £50!

Tandem cylinder is a good mod, independent feeds to Front and Rear, but a stock single system should work as well under normal driving.
Will you fit the new one now?

911hillclimber wrote:Tandem cylinder is a good mod, independent feeds to Front and Rear, but a stock single system should work as well under normal driving.
Will you fit the new one now?

I will try some weekend. Maybe not this. How many hours for a numpty like me? 1-2 hours to change then another hour to bleed?

Yes, spot on esp if the wife does her job right!

neilbardsley wrote:

911hillclimber wrote:Tandem cylinder is a good mod, independent feeds to Front and Rear, but a stock single system should work as well under normal driving.
Will you fit the new one now?

I will try some weekend. Maybe not this. How many hours for a numpty like me? 1-2 hours to change then another hour to bleed?

If you’ve not got one, buy or borrow a proper brake fitting spanner as the fittings are easy to round off using a standard spanner

hot66 wrote:

neilbardsley wrote:

911hillclimber wrote:Tandem cylinder is a good mod, independent feeds to Front and Rear, but a stock single system should work as well under normal driving.
Will you fit the new one now?

I will try some weekend. Maybe not this. How many hours for a numpty like me? 1-2 hours to change then another hour to bleed?

If you’ve not got one, buy or borrow a proper brake fitting spanner as the fittings are easy to round off using a standard spanner

I wasn't aware that a brake fitting spanner existed. Which nuts/bolts are you talking about? On the hoses I've been using 17mm and 11mm. On the bleed screws 7mm?

its nothing particularly fancy, but does a much better job and gives you a better chance of not rounding the fittings ... assume 356 fittings are standard size ?

this kind of thing

https://www.halfords.com/workshop-tools ... re-spanner

Changed the master cylinder today. Took for a short test drive. Bite further down the pedal but this may be because the pedal needs adjusting to the new cylinder?

I'm not sure if the problem is resolved a longer drive is needed

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You adjust the throw on the rod, but also are all the shoes adjusted correctly?

I adjusted them a while ago but worth checking. I normally adjust to the point just before I can hear any contact

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Victory!!

I now have a firm, high bite. I adjusted the pushrod but completely lost the firmness. Then I decided to check again and saw the 2nd nipple on the front wheels!!! Numpty of the year award but lots of lessons learnt.


Now the car needs a service as its backfiring as I take my foot off the gas as it drops from the main to idle circuit.

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