rogerowen Posted October 15, 2023 Report Share Posted October 15, 2023 Just wonder if anyone has had experience with this concept. I have an aftermarket traditional vacuum servo brake unit that I'm about to fit to my TR4A, but saw this and wondered if anyone has fitted one. Quote Link to post Share on other sites
RogerH Posted October 15, 2023 Report Share Posted October 15, 2023 This is almost watchable Roger Quote Link to post Share on other sites
Motorsport Mickey Posted October 15, 2023 Report Share Posted October 15, 2023 56 minutes ago, rogerowen said: Just wonder if anyone has had experience with this concept. I have an aftermarket traditional vacuum servo brake unit that I'm about to fit to my TR4A, but saw this and wondered if anyone has fitted one. Be wary of insurance, no previous fitments to give accreditation, all down to you . Mick Richards Quote Link to post Share on other sites
stuart Posted October 15, 2023 Report Share Posted October 15, 2023 One of the guys in here with a 6 has an electric vacuum booster from an Audi so he might know the setup Stuart Quote Link to post Share on other sites
Malbaby Posted October 15, 2023 Report Share Posted October 15, 2023 (edited) Most electric vacuum pumps, as in your pic, are used in conjunction with the traditional vacuum brake booster when adequate/prolonged vacuum is not available from performance "cammed" engines....Don't see the need for an additional electric vacuum pump on our TR's...Some guys have used a larger booster, eg. Volvo twin diaphram [involves some fabrication]. The old skool way of providing extra vacuum was to fit an electric vacuum pump with a pressure switch to operate, a relay and smallish additional vacuum storage tank. Edited October 15, 2023 by Malbaby Quote Link to post Share on other sites
Michel Higuet Posted October 16, 2023 Report Share Posted October 16, 2023 It's crazy how much it's possible to install on a TR that I don't need, I'm learning about it every day... Quote Link to post Share on other sites
Andy Moltu Posted October 16, 2023 Report Share Posted October 16, 2023 The Volvo servo would take a fair bit of modification on a TR4a as it would really need a swap to the 5/6 pedal set up and the dual circuit brake plumbing It’s pretty straightforward to fit aftermarket servo into the single circuit 4A brake system and use the engine vacuum to power it. Kits are readily available and cheap. There were more expensive options with genuine Girling servos but they are much harder to find these days. If you use an electric server pump you will still need a servo and plumbing. If you are concerned about running out of vacuum, you could use a reservoir tank as fitted to some of the Triumph saloons. The lack of vacuum is not much of an issue on the 4 cylinder cars. More so on the 6 because of a restriction on the diameter of the servo, however the diameter of the remote servo is greater and already offers more assistance. Additionally the wilder cams and even the 150bhp cam don’t produce much vacuum to work on the small servo. This is less of a problem with 4 cylinder TRs. The other thing that gets overlooked is that the servo just makes the pedal lighter, it doesn’t reduce stopping distance. I only put one one the 4A when I was recovering from a ruptured Achilles’ tendon and wanted to be confident I could lock the brakes without putting too much load on it. Quote Link to post Share on other sites
Z320 Posted October 16, 2023 Report Share Posted October 16, 2023 NNAA (no need at all) Quote Link to post Share on other sites
Nigel C Posted October 16, 2023 Report Share Posted October 16, 2023 11 hours ago, Michel Higuet said: It's crazy how much it's possible to install on a TR that I don't need, I'm learning about it every day... Quote Link to post Share on other sites
Malbaby Posted October 16, 2023 Report Share Posted October 16, 2023 Andy's summation comments are excellent. Quote Link to post Share on other sites
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