Bicycle Mechanics and Repair DecalMechanical Engineering 98/198

Spring 14

Lecture 3 – staaaahp it

Components

Lever

Caliper

Cables

Caliper

Main Brake Types - Side Pull Brakes

Dual Pivot Single Pivot

Main Brake Types - Center Pull Brakes

Cantilever U Brake

Main Brake Types - V Brakes

Dual Pivot Brakes in Detail

Other Types of Brakes

Brake Cable FunctionConnects brake lever to brake

Cable

Inner Sleeve

Steel Structure

Plastic Coating

Replacing Brake CablesReplacement Cable Should have the same “Nipple”

Pear – Road Bikes Standard – Mountain Bikes

Do Not Confuse Brake and Gear Housing!!!!

Before Adjusting Your Brakes

Wheel must be centered in the fork.

Wheel must be true(no wobble side to side when rotated)

Aligning Brake Pads

Make sure the pad is centered in relation to the rim.

Brake Toe-In

To prevent brake squeal and ensure even contact, angle the pads towards the direction of rotation of the wheel(front of bike).

Use a dime or a credit card to help set the gap.

When to Replace Pads

Metal shards embedded in pad rubber

Step worn into pad

When To Replace Brake Pads

Check the grooves to see when brakes should be replaced.

New!!Safe!!Awesome!!!

Worn. Needs to be Replaced!

Maintaining Brake Pads

• Keep both the rims and brake pads clean Remove and large

particles Sand brake pads Clean Rims with

degreaser

Don’t use oil or grease!!

Disc Brakes!Mechanical Hydraulic

Cable activated Fluid Activated

Features of Disc Brakes

- Hub mounted disc

- Frame or fork mounted

caliper

- Pads squeeze the hub

mounted disc through

mechanical pull or fluid

pressure

- Kinetic energy gets turned to

thermal energy through

friction!

- More power than rim

brakes

- Work in all weather

conditions

- Also heavier than rim

brakes

- Gives you mad power at

the lever!!! MOAR

POWER!

Braking Tips…

... So this doesn’t happen to you

Tips

Cornering: Use both brakes

Emergency Braking Mostly front brake! Lean back!

Front Brake: 95% of braking power

Rear Brake: Use on slippery surfaces and when turning