rg500 Posted October 25 Share Posted October 25 Here goes I went to go out in the supe today but when I pressed down on the brake pedal absolutely nothing went straight to the ground. I started the engine still the same thing I checked the reservoir and all okay all at proper levels, I can hear a swooshing sound like I can can hear air from somewhere, another thing that is happening when I pump the brake pedal I increases the revs slightly. I believe it could be the servo but hope that it isn’t and wondered if anyone else has had a similar experience. Thankfully it was okay last week as it sailed through the MOT just a bit strange that a week later it just stopped working. Quote Link to comment Share on other sites More sharing options...
jagman Posted October 25 Share Posted October 25 Sounds like the master cylinder seals gone , fluid just going round . Usually you get some sort of braking with the servo gone - much rarer for a servo to fail but possible Quote Link to comment Share on other sites More sharing options...
rider Posted October 25 Share Posted October 25 (edited) Sounds like you have a servo issue. These are available from Whifbitz for £1,400 or you can seek out a cylinder rebuild kit: https://toyota.epc-data.com/supra/jza80/94022/chassis/4702/04493/ Edited October 25 by rider (see edit history) Quote Link to comment Share on other sites More sharing options...
jagman Posted October 26 Share Posted October 26 If it’s a servo fail , cars are getting on a bit now , you may have a few options : new OE available from Japan circa £500 , not 100 % sure if the jap spec/U.K. spec are the same , but people have swapped front callipers and not had issues . The LS 400 booster looks the same , 9.5 inch but not 100% sure on the travel distance ,but 4 bolt fit and 2 bolt master with vent at the same position - these available under £200 new reman . All sorts of part numbers around and diagrams sometimes show 3 bolt master (may be a generic pic) my guess is the Lexus 400 one is as close to identical as needed ? Similar callipers set up as supra so pad movement vs hydraulic movement will be very close Quote Link to comment Share on other sites More sharing options...
rg500 Posted October 26 Author Share Posted October 26 Thanks guys, been doing some digging jagman I think you’re might be right about the ls400 certainly cheaper than the supra equivalent things are getting mighty expensive nowadays. If I was to spend the sort of money original parts are, I was looking into performance upgrades as well such as Chase Bays Dual Piston Brake Booster Delete with Bolt-On 6:1 Pedal Ratio. Has anyone had any experience with upgrading the brake booster either with this brand or any other brand. Quote Link to comment Share on other sites More sharing options...
jagman Posted October 26 Share Posted October 26 I don’t think I would class a booster removal an upgrade - looks like they just remove the booster ,which adds a force of whatever the area is 9.5 inch diameter x the vacuum pressure - as an assistance and add some lever length to the pedal input multiplying your leg force - the master piston diameter dictates the amount of fluid moved , the force and distance of the pedal travel . There are 2 OE sizes 1 inch jspec and 1 1/8 inch on later cars (due the extra pistons in callipers) larger or more pistons (area ) move less distance so more fluid needs to be moved . So the chase bays master is smaller than the late supra stock one . Jspec less pedal force and longer travel vs late (U.K.) more force needed bit less travel . The brakes will all lock up or hit abs and stop exactly the same but with different force and travel - after market callipers will alter again the pad travel depending on their piston area . More about preference than an upgrade and very little difference between U.K./jap - personally chuck norris braking is not for me - servo please ! Quote Link to comment Share on other sites More sharing options...
rg500 Posted October 27 Author Share Posted October 27 That makes perfect sense jagman, I will look into getting either getting the ls400 one or bite the bullet and just get one directly from Japan certainly not one from whifbitz at £1400. Quote Link to comment Share on other sites More sharing options...
rg500 Posted October 27 Author Share Posted October 27 Does anyone know if the Lexus gs300 has the same brake booster as the supra ge non ABS. Quote Link to comment Share on other sites More sharing options...
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