![]() ![]() The simplest way to look at it is the booster provides assist. Now that we have told you which direction we would send you, we think it is important to understand what the number of diaphragms means along with the size. In this case, we would recommend a 9” single diaphragm system which is a great choice for drum brake equipped vehicles. The brake pedal would almost have the feel that the brakes were connected to an on/off switch with no middle ground. This is a worry as too large a booster would make the drum brakes apply very quickly which would put you through the windshield. Room would again enter into the equation but our focus now becomes not putting too much booster on the vehicle. Let’s say the customer is wanting to keep the factory drum brake system. Now, let’s change the scenario up a little. Therefore, we put as much booster in the space we have available. You may want to use a larger booster but some applications only provide a certain amount of room. ![]() If the customer were using a BBC for an engine, we might be forced to drop back an 8” dual diaphragm booster. We would choose this option as the 9” dual has as much potential assist as any booster we provide and because the customer is using a SBC engine, there is plenty of room available. This would include a master cylinder of either a 1” bore or a 1-1/8” bore depending on what had been chosen for the calipers (we will discuss this in another post). So, for our example here, let’s assume the customer is electing to go with four-wheel disc brakes and the truck is being powered by a hopped up small block Chevrolet.įor this example, we would focus the customer towards a 9” dual diaphragm booster (p/n: BM17875-1 or 2). To the contrary, if a customer is keeping the truck drum brakes but is just looking to make the pedal feel a little better, too large of a booster might make a vehicle tough to drive due to the very touchy brakes the vehicle would now have. If a customer was using disc brakes in the front and even disc brakes in the rear, we cannot recommend a large enough booster. We have to ask this question right up front because it will dictate which direction we might take. If a customer gave us this scenario, we would then be forced to ask questions of the customer and we would start with asking if the vehicle is disc or drum brakes. Let’s look at a possible scenario using a late-60’s Chevrolet C-10 Truck as an example and see if we can shed some light on what you should be looking for and which one to choose. We get that question at least a few times a week and every one of the people that have asked that question is correct. ”I want to convert my car to power brakes from the current manual brakes but there are so many options of different booster sizes.
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