After about an hour straight of driving today, the brakes on the 40 seem incredibly weak. Needed serious down-shiftage to stop. The clutch rubber is dry rotted and that's the reason it's weak shifting... But the brake master looks really clean, holds fluid, etc. But the f***er is weak ONLY after it gets hot, etc. Just wondering is the wheel cylinders could get old/hot and be weak, etc. Or the brake master/booster? Brake guys? Get on it. Thanks.