Good news for sprint servos

[xvivalve]

The photographs are of the two servo's used on 1500 dolomite's and as you will be able to see the depth of the units is the same and it is only the diameter that has changed.

Yes, but I believe they are deeper than a Sprint one which has a larger diameter...

[xvivalve]

North West member fitted a readily available Land Rover Unit to his Sprint, looks virtually the same as the original and only required a small amount of work to fit. The plate inside is metal so won't break like the original. Believe they are cheap too.

He has indeed. I'm not sure of the detail of what he had to do, but believe it involves an adaptor plate to accommodate a different PCD?

The replacement component is merely an option on this and I have no idea of costs. I doubt they'd supply it as a component due to product liability issues, so it would likely be part of a refurb service. There are those amongst us to whom originality (or as close as we can get to it) is important...

[SprintMWU773V]

I agree originality is important to many and efforts made to secure a replacement component are always welcome. I have dropped Paul a message though regarding the LR one and have asked for details on the adapter he made.

I think the general rule on servos is that if they rattle then they are no good!

[xvivalve]

Yes, broken ones rattle, but take the nuts and washers off the mounting studs before shaking!

I have three that are silent, and one that goes 'spoing' when you put it down on a hard surface!

[SprintMWU773V]

Paul came back to be, he was on his holidays!

He's uses a Land Rover Type part number STC2878 which is readily available for £60-80 new. They are perfect for fitting the master cylinder too however you will need to fabricate your own actuator rod as the one supplied is too short. You'll also need to produce a mounting plate as the bolt pattern is wrong for a Dolomite. This can easily be done using aluminium. It's hidden by the bulkhead padding so you won't really notice it. Some fettling/replacement of some of the brake pipes may be necessary as is elongating the hole where the stiffener bolts to the wing turret but these may not be necessary in all cases.

The biggest plus of this conversion is that there's no plastic to go brittle and break. These feature a metal plate so are more forgiving shall we say. Stocks aplenty so it could be a good fix for those who want a decent servo for not a lot of brass. Paul reports braking effort is at least as good if not better than original, insurers he spoke to were also OK with the modification.

He has produced some detailed drawings and write up. I suggested he send them to the Dolly Mixture editor for publication. Having seen the conversion I can confirm it's neat and though slightly different to original it is in keeping and looks fine.

[sprint95m]

Thanks for the part number.
Cross referencing the number via ebay I now know which Land Rover to look for.




Ian.

[tony g]

Mark, can you add any more detail about the adaptor plate needed? If you mean the 4 studs through the bulkhead, does the adaptor plate need to really thick or is that just me

Cheers

Tony

[SprintMWU773V]

Mark, can you add any more detail about the adaptor plate needed? If you mean the 4 studs through the bulkhead, does the adaptor plate need to really thick or is that just me

Cheers

Tony

Paul did sent some drawings but you may find them tricky to view on here. Hopefully they'll end up in DM where they will be easier to see. The plate is not particularly thick, 20mm is quoted here.

[tony g]

Thanks Mark thats what I was thinking he was doing.
Cheers

Tony

[sprint95m]

In my opinion Paul's adapter plate is over the top, somewhat?

I was thinking that to incorporate a servo with a bigger mounting studs' PCD I could weld a flange (and webs) to the pedal box?


To stop the bulkhead flexing it is important to have a good brace from the master cylinder mounting on the strut turret.





Ian.

[SprintMWU773V]

In my opinion Paul's adapter plate is over the top, somewhat?

This is what happens when an engineer sets to work on a project! It's a nice solution.

[sprint95m]

Panzer or T34?




Ian.

[James467]

I have seen Pauls servo and it looks very nice.

I have been badgering him for a while for his adaptor plate drawing, good job!

[James467]

£48.50 plus the VAT from Island 4x4 for the Britpart one.

I may fit one to RUK.

[paul6car]

After speaking to Mark Gibson at Tatton Park show a couple of weeks ago I thought I should add a couple of comments to the Replacement Brake Servo thread.
My Sprint servo failed with the usual cracked plate which supports the internal rubber diaphragm.
A friend of mine had a similar failure in his servo and was unable to press the brake pedal due to pieces of plastic jamming the servo. This meant no brakes.
After having my servo reconditioned with an old serviceable plastic plate I supplied, I decided to look for an alternative servo.
The spares coordinator for the Land Rover 101 club had been involved in a similar project because their original servos were basically the same as the Sprint. He said he had used a similar type fitted to a more modern Land Rover.
I obtained one of these servos and decided to fit it to my car for evaluation.
The main problem was the centres of the fixing studs were not the same as on the Dolly. The studs for the master cylinder were ok.
I didn’t want to modify either the servo or the car and so after a discussion with a couple of members from the North West section I decided an adapter plate and an adjustable brake pedal pushrod were the way to go.
I have had it fitted for a couple of years with no problems.
The braking seems to be better than with the original servo, I think this may possibly due to the design of the air admittance valve on the pedal side of the metal diaphragm letting atmospheric pressure in faster than the one in the plastic plate did when the brakes are operated.
To produce a metal plate from scratch to replace the plastic one would involve a fair bit of machining and to make new plastic plates would be expensive because of the tooling etc required.
It may be useful, if there is a demand, for the club to investigate the route I followed and provide a fitting kit for the alternative servo.