Boster adalah perlengkapan tambahan pada sistem rem yang berfungsi untuk memperbesar gaya pengereman
1. Karet diafragma 2. Katup udara 3. Katup vakum 4. Tuas pendorong 5. Katup pengontrol vakum
6. Tuas rekasi 7. Torak boster 8. Tuas pendorong 9. Saluran vakum 10 Katup satu arah
Braces
Braces guide auger bits and drills. Attaching a screwdriver bit converts them into powerful screwdrivers. Drilling is done by turning the handle or center section in a circular motion. Pressure for drilling is given by bearing down on the head of the bit brace with the heel and palm of the hand. The head on the best bit braces is mounted on ball bearings so that it will turn freely from the rest of the brace. Most braces incorporate a ratchet control that permits the user to make half circles when there is no room for a full circle.
Push Drills
A push drill, similar in appearance to a push-pull screwdriver, operates by a pushpull movement using a spirally headed shaft and chuck to hold the bit. Push drills are best for light jobs. Most have space in the handle for storing extra drill points.