DISC BRAKES

 

O - other possible causes

I - most probable cause

problem

Causes

Excessive pedal travel

Hard pedal

Grabbing or pulling

Fading pedal

Noise and chatter

Dragging brakes

Master cyl. Fluid low

I

  

O

O

    

Air in hydraulic system

I

  

O

      

Hoses soft or weak

I

  

 

O

    

Caliper seals soft or broken

I

  

I

  

O

I

Power brake malfunctioning

  

I

  

 

    

Fluid soiled brake lining

  

I

I

  

 

 

Lines/hoses collapsed/kinked

 

I

I

  

 

I

Caliper pistons frozen/seized

  

I

I

  

O

I

Master cyl. cups swollen

 

I

 

  

 

I

Master cyl. bore rough

  

I

I

I

  

 

Caliper cyl. bore rough/worn

  

I

I

I

O

I

Pedal linkage binding

  

I

O

  

 

  

Metering valve not working

  

I

I

      

Leaking hose connections

O

  

O

I

    

Caliper cyl. seals damaged

O

    

I

O

I

Bleed screw open

O

    

I

    

Lines/hoses ruptured

O

    

I

    

Disc warped

        

I

O

Disc out of parallel

    

O

  

I

O

Disc has rough castings

        

I

O

plugged master cyl. port

  

O

      

I

Pressure check valve

  

O

      

I

Push rod misadjusted

  

O

      

I

Caliper loose

    

I

  

O

  

Poor quality brake fluid

      

I

    

Poor quality brake lining

      

I

I

  

 

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