nadg63 Posted July 18, 2016 Share Posted July 18, 2016 Have decided I need to get my heap finished before I can decide it's fate so need to get it to stop better.First up is upgrading the brake servo, what are people using? Anyone tried a Rover SD1 unit?Cheers. Quote Link to comment Share on other sites More sharing options...
Beans Posted July 18, 2016 Share Posted July 18, 2016 I seem to remember you upgraded the (front) brakes on your car with a Volvo based set up?If so what is the problem with this set up? Quote Link to comment Share on other sites More sharing options...
nadg63 Posted July 18, 2016 Author Share Posted July 18, 2016 That's correct Beans, along with braided lines. Basically it just doesn't feel like the brakes are doing anything and it's the loss of momentum slowly stopping it. Quite likely the original servo isn't performing so if having to mess with that I may as well upgrade. Quote Link to comment Share on other sites More sharing options...
Beans Posted July 18, 2016 Share Posted July 18, 2016 How's the pedal feel; firm/spongy/... ? Quote Link to comment Share on other sites More sharing options...
Ridgetone Triumph Posted July 18, 2016 Share Posted July 18, 2016 I have fitted an SD1 servo to my TR7 V8 taken from my SD1 Vitesse in actual fact I have used the entire SD1 Vitesse brake system through out. I had to modified the connecting rod to the brake pedal and make all new lines but the pedal feels really good and the brakes sharp. 😉 Quote Link to comment Share on other sites More sharing options...
nadg63 Posted July 19, 2016 Author Share Posted July 19, 2016 Quoted from Beans How's the pedal feel; firm/spongy/... ? Not too bad from memory - still not being driven Quote Link to comment Share on other sites More sharing options...
Beans Posted July 19, 2016 Share Posted July 19, 2016 So might very well be that there 's no problem!? Get the car on the road and enjoy it 😉 Quote Link to comment Share on other sites More sharing options...
nadg63 Posted July 20, 2016 Author Share Posted July 20, 2016 Quoted from Beans So might very well be that there 's no problem!? Get the car on the road and enjoy it 😉 Oh no, there is definitely a problem! The two times I have driven it, (all of 12kms in total), there is just nothing there in the brake department, scary! Will investigate it some more, something is amiss!? Quote Link to comment Share on other sites More sharing options...
JohnD Posted July 20, 2016 Share Posted July 20, 2016 nadge,You have a problem with your brake system, so that "there is nothing in the brake department" - and you plan to fit a servo to cure the problem?Think about that for a minute, a second even. You don't know what the problem is, you haven't cured it, and you want to do major surgery on the car.That's right, it's not a sensible idea. FIND THE PROBLEM FIRST!Then consider if you want a servo.In fact, servos are excellent, fopr people with arthritis or other ailments that make it difficult for them to push hard on the pedal, becasue all it does is amplify that pressure, and only up to a point as well.A servo can never "improve" braking ability, which is a property of the efficiency of the braking system, the condition of the parts within it, and finally the state of the tyres.I strongly suggest that you investigate your brake system and find out why it's not working properly. Start by a close examination of the master cylinder and work through to the wheel cylinders and brake pads/shoes.If it's working as badly as you say, there will be some problem that such an examination will detect, and that you can deal with.Good luck!JOhn Quote Link to comment Share on other sites More sharing options...
A TR7 16V Posted July 20, 2016 Share Posted July 20, 2016 I sort of agree with JohnD - find the problem, not mask it. But I think servos have their place.There's a really easy test for the servo, however. Just start the engine with your foot on the brake. If the pedal doesn't move down substantially for the same foot pressure as the engine fires, then the servo is not working. The problem is what is substantially. If IRC fromt the last time I did that with a 7, it should be more than an inch of movment under your foot, but it's been a while.Graham Quote Link to comment Share on other sites More sharing options...
Beans Posted July 20, 2016 Share Posted July 20, 2016 Quoted from nadg63 ... there is just nothing there in the brake department ... In that case I fully agree with John, find out what the problem is first. Quote Link to comment Share on other sites More sharing options...
JohnD Posted July 20, 2016 Share Posted July 20, 2016 Graham,That tests the operation of the servo, but not its function.And i's function is only to assist the driver by using engine power to increase the hydraulic brake pressure, up to a point.See chart.Brake efficiency relys on the state of the brake system, and the efficiency of its parts.In general, you should be able to lock the wheels of any Triumph at any speed above walking.If you cannot, then the brakes aren't working properly, and a servo will not improve matters.Yes, servos do have their place, along with power steering. Many/most moderns have both and they work very well.But a servo is NOT the answer to a poorly working brake system on a Triumph, or any classic.John Quote Link to comment Share on other sites More sharing options...
A TR7 16V Posted July 20, 2016 Share Posted July 20, 2016 Testing the servo's operation is all the test is meant to do. I understand the servo's function is as a mechanical force-amplifier, with a fixed gain and a maximum dynamic range. But the requirement for amplification is a design issue, not test and maintenance. And the servo had a big part to play in the design of the TR7 at least. It let BL fit the same brakes as the HA Viva had to a much (well a bit) higher performance car. Saved them loads of money. Though not necessarily enough to make a profit.Graham Quote Link to comment Share on other sites More sharing options...
JohnD Posted July 20, 2016 Share Posted July 20, 2016 Didn't know that story! In the chaos that was the introduction of the TR7, even Graham Robson doesn't mention it in the "Works Triumphs" as one of the many problemes they had to deal with.A 'sports car' with tiny family runabout brakes, gosh!But it says much for the ability of brake systems to work well, given enough foot power, and only to need a servo if the driver is handicapped or the system is an inadequate design.John Quote Link to comment Share on other sites More sharing options...
RobPearce Posted July 21, 2016 Share Posted July 21, 2016 The front pads on a standard TR7 are the same as a Mini of the same era. They don't last very long if driven enthusiastically, especially not if driven hard, like I drove mine on the 1996 RBRR. Quote Link to comment Share on other sites More sharing options...
Beans Posted July 21, 2016 Share Posted July 21, 2016 Pad area of the original brakes is a joke and together with the rather flimsy discs are rather prone to overheating 😲 Quote Link to comment Share on other sites More sharing options...
nadg63 Posted July 23, 2016 Author Share Posted July 23, 2016 Cheers for all the replies guys, don't worry JohnD more investiagtion will be carried out before I spend any more money on the heap of junk. Grrrrrr. 🤔 Quote Link to comment Share on other sites More sharing options...
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