Roger Rabbit Posted October 13, 2016 Share Posted October 13, 2016 Hi everyone, i owned a Birkin S3 since last year. There are 3 brake fluid reservoirs installed and the one in the middle now is empty, the car runs normal and stop normal , and no problem with the gear change too. Is there anyone know where that middle reservoir leads to ? Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
Tbox56 Posted October 13, 2016 Share Posted October 13, 2016 They should be 1 for front brakes 1 for rear brakes and 1 for clutch. I would guess that the person that built your car made the middle one the rear brakes. the bias bar should be set heavy to the front therefore you are not noticing that you have no rear brakes. Tom Link to comment Share on other sites More sharing options...
Roger Rabbit Posted October 13, 2016 Author Share Posted October 13, 2016 Thank you Tom. [emoji4] Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
Roger Rabbit Posted October 13, 2016 Author Share Posted October 13, 2016 I did check the brake caliber sat the rear and they looks dry. The lines going from the reservoir to the pedal box also shows no signs of leak. Is there any hidden junction or connection point I have to pay attention to ? Roger. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
scannon Posted October 13, 2016 Share Posted October 13, 2016 Trace the line coming from the empty reservoir/master cylinder and see if it in fact goes to the rear brakes. Perhaps the builder connected all four brakes to one master cylinder. Try opening a rear bleeder port and pump the brakes to see if any fluid comes out. Link to comment Share on other sites More sharing options...
Roger Rabbit Posted October 16, 2016 Author Share Posted October 16, 2016 Thank you for the info Scannon, I did trace the brake line and finally found the leak is coming from a brake light pressure switch. It is hiding nicely...... Hope it is the only leak. Thanks again anyway. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
scannon Posted October 16, 2016 Share Posted October 16, 2016 You're welcome. I suspect you have had no functioning brake lights since the MC started pumping air. Link to comment Share on other sites More sharing options...
Roger Rabbit Posted October 17, 2016 Author Share Posted October 17, 2016 No surprise. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
Roger Rabbit Posted October 17, 2016 Author Share Posted October 17, 2016 By the way, do you think dot 5 brake fluid is a good idea ? Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
coffee break Posted October 17, 2016 Share Posted October 17, 2016 I'm a fan of DOT 5. I used it in a '80 Dodge Colt and had no brake system issues for 16 years. I would be using it now but it is not compatible with ABS. As long as the hydraulic system is in good condition it shouldn't be a problem, BUT make sure the seal materials are compatible with DOT 5 fluid. Link to comment Share on other sites More sharing options...
Roger Rabbit Posted October 18, 2016 Author Share Posted October 18, 2016 Appreciate to your info., will consult my mechanist before I go ahead. Actually my buddy is using dot 5 in all his collections of classic automobile without a problem, and he believe it should be ok in my 7. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
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