Series 3 brake servo on a series 1

[jingleycatjaguar]

Hi, I have never had really good brakes on my series 1 2+2 despite renewing the servo, master cylinder, rear calipers and fitting Zeus front calipers. Is there any advantage in fitting a series 3 servo ?

Steve, goes well but doesnt like stopping

[Heuer]

No - the brake system you have should be superb so there may be a fault with it. I have something similar (albeit with ventilated discs) and have done the Rallye des Alpes without problems. Two suggestions though - try fitting Greenstuff pads and fit the servo heat shield if it is absent. This was a retro fit on the S1 4.2 cars after its effects were observed on the S2 cars. Brake feel on my car improved enormously when I fitted one. Dave Kerr sells them but none of the other suppliers have a clue Send Dave a PM (Dave K) if you want one. You could make your own but getting the correct insulating material may be difficult.

[PeterCrespin]

May have been retrofitted to early 4.2s but it was used from at least 1966 as clearly shown in the 2+2 parts book which is the first new parts book they did after the original 4.2 revision.

I agree there's something wrong by the sound of it, although if the wheels can be locked there's only pedal feel to play with. I'm running an S3 servo as it happens and of course S2 brakes are three-pot anyhow. Changing the servo will only alter pedal effort - the retardation of the brakes won't really change and mine are great on standard pads easily able to lock 205 tyres if I put my size 12 in it.

The ultimate braking efficiency is dictated by the tyre grip and once your brakes are able to lock the wheel no improvement in stopping distance is possible, no matter how much voodoo stuff or money you throw at them.

Pete