Hello, a new member with a problem. Had an RPI sports exhaust fitted & now in warm weather and in traffic experienced the brake pedal movement gone and rear brakes applying. It a 96 Plus 8 with alloy rad, kenlowe fan, plus I've tried bonnet extension brackets, heat shielding, exhaust wrap, moving reservoir to bulkhead and DOT 5 fluid the problem persists. I think the under bonnet heat and the proximity of the exhaust manifold to the servo causes the brake fluid to expand thus applying the rear drum brakes? Anyone else experienced this and all help much appreciated. Thanks