You most likely have a fluid leak in your brake system or a bad master cylinder.  Another reason for this is you might not have tightened your bleed screw on one or more of your calipers.

A low brake pedal that has to be pumped may be due to a low fluid level and/or air in the lines.

This is most likely the case of improperly bed brake pads.  Once the pads and discs are glazed the amount of friction (bite and torque) is greatly reduced.  This could also be the result of choosing the incorrect brake pad compound for your application.

In most cases this is a result of boiling your brake fluid.  Another of the usual suspects are faulty master cylinder or a leak in either the caliper or the brake lines.

Brake fluid is subjected to very high temperatures.  It must have a high boiling point to avoid vaporizing in the lines. This vaporization is a problem because vapor is highly compressible relative to liquid, and therefore negates the hydraulic transfer of braking force from the

A soft or spongy pedal is most likely the result of air in the brake system.  Air bubbles may have entered the system because the fluid level got too low.  The air could have been from a small leak in the brake hose(s) or a

The most common reason is over-torqued or unevenly torqued lug nut(s).  Making sure you use a proper torque wrench with all four wheels on the ground is the best approach.  The use of an impact wrench is NOT recommended.  Your vehicles manual will indicate the

Cracked discs or pad material build-up on the disc surface.  Excessive disc run out is another reason for oscillating feedback.

Brake squeal often happens during the first few hundred miles of use as pads bed in to a new or used discs.  It’s best to wait until you have about 1,000 miles (1,609km) before determining if there is a noise problem with your pads.  Some

Warped discs
Bad master cylinder
Caliper spread – which can lead to tapered brake pads
Calipers are not square to discs
Caliper piston(s) are not retracting properly causing one or more pads to constantly make contact with the disc surface.
Debris in the caliper