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It sounds as if you may have a leak on the servo, this will make the brakes go hard as the air leaks out. This can also make it hard to start as the mixture is affected by the extra air getting in. Without servo assistance on brakes the pedal will be hard. To test start the engine if you can with your foot on the brake, if it starts and the pedal does not go down, the servo is not working. Obviously you need the engine running for this, but you can also check the airline going to the servo for holes, normally this goes from the inlet manifold to the servo. This image shows the servo with the hose leading out, you can follow it to the manifold, make sure the engine is not hot before touching anything. typical brake servo connection on car engine Google Search
if I say possible servo booster is faulty,surely you will feel it on the brake pedal ( stiff ),or the engine running would be erratic.the other alternative situation is the pipe( hose ) which is connected with inlet manifold and servo booster and inside has the check valve probably is faulty. Test : off engine,pump brake pedal several times till gets stiff. Keeping your foot on brake pedal start the engine and if your servo works fine then the pedal goes a bit down,if not will not move at all. If the engine is running erraticly then with engine off, remove the pipe connecting manifold and servo block the pipe you remove from servo side,block it and start the engine,If engine run fine,then you must confirm whether is the servo or the check valve hose. For the check valve hose how to check,just put in your mouth the servo side pipe and blow into,if the air goes in the engine means that the check valve is broken and you must renew the pipe with check valve,if on blowing into will not allow air to get through,means is ok and the servo is the fault. Good luck.
Hello apan..... you may be able to repair it yourself using some epoxy adhesive. this is a very strong bond. you can get it at any home depot, lowes or other hardware store. It comes in several drying time categories such as one minute, 5 minute, 60 minute.
If possible it is always a good idea to clamp it as it dries. Joe
Disconnect the servo at the receiver, remove the servo horn and linkage from the servo. Remove the four screws that hold the servo to the chassis. Replace with new servo, plug new servo into receiver and turn on transmitter and receiver. With transmitter and receiver on reattach servo horn and linkage. This will make sure that the servo is centered at neutral throttle.