car techie

Custom Search

Accessories     Absorber      Air-conditioning     Alignment     Battery    Car news     Car photos     Carburetor     Clutch      Compression     Color      Converter    Disc brakes    Door    Engine    Gasket   Gear    Glass     Ignition     Light     Maintenance     Oil / fuel

<<Prev

Next>>



 
Buy a car
 
Brake fluid

Question : WHICH brake fluid best suits my car, DOT 3 or Dot 4 ?

My braking system has ABS, EBD and BA.

The service manual says that both can be used.

However, I would like to know which one is more advantageous in terms of braking efficiency ( hard braking conditions ), heat tolerance and the general properties ( for example, viscosity, lubrication quality on the brake pumps, ABS servos, etc )

The OEM service centre states that DOT 3 is preferred, but I am not sure why since DOT 4 is supposedly a higher grade type

Answer : The differences between DOT 3 and DOT 4 are as follows :

  DOT 3 DOT 4
Dry boiling point ( min C ) 205 230
Wet boiling point ( min C ) 140 155
Cold viscosity at -40 C mm2/s 1,500 1,800

DOT 4 brake fluids are less sensitive to moisture in the fluid and therefore in our climate would be a better choice to DOT 3.

Also, if one is doing a lot of hilly driving, the DOT 4 fluids have a higher boiling point and therefore less liable to "brake fade".

 
 

Brake vibrations

ABS doubt

Brake failure

Disc types

Handbrake use

ABS system

Engine braking

Brake horsepower

Brake fluid

Worn brake pads

Faulty ABS

Handbrake danger

Squealing brakes

Unsettling brakes

 

Disc brakes 1

Disc brakes 2

 

 

Others
 
Piston
 
Polishing
 
Rim
 
Roof
 
Sensor
 
Sound
 
Spark plugs
 
Spring
 
Stains
 
Steering
 
Suspension
 
Tappet
 
Timing belt
 
Tyre
 
Valve

     

Sites of similar field are welcome for exchanging links