Quick Overview PG Plus hydraulic brake master cylinders use aluminum and iron castings for an exact match to the design of your vehicle's original equipment Technically advanced components ensure safe and reliable braking With PG Plus premium products, you can be certain that your replacement brakes perform as good as your original equipment Castings match original equipment design with aluminum used where appropriate, so that reduced weight does not stress the brake booster mounting PG Plus hydraulic brake master cylinders use aluminum and iron castings for an exact match to the design of your vehicle's original equipment. Technically advanced components ensure safe and reliable braking. With PG Plus premium products, you can be certain that your replacement brakes perform as good as your original equipment .