wat the difrence and wat do they mean ??? besides that they have diffrent bolt patterns if even that not sure

 

drum mean you have an open differential

disc mean you have limited slip differential

 

On the RX-7 that may be true,but it doesn't really answer his questions.A drum brake system is an enclosed brake that looks like well a drum on its side.It uses a brake shoe that is crescent shaped,and pushes out on the outer edge of the inside of the drum.A disk brake is an exposed system that uses prake pads on each side of a brake disk and squeezes from both sides to slow the car.Both systems have there advantages,and disadvantages,although everyone on here will ask what are the advantages of the drum brake.Trust me there are advantages to a drum.The biggest advantage I see to a disk is the ease of replacemnet of the pads,and on the RX-7 it means you have a limited slip differential in the axle housing.Also the disk I think would exchange heat better than a drum due to its open air design.Race cars use disks because they are better,but the drum brake is shot down so much as a waste of time in bothers me sometimes.They are not as bad as everyone thinks they are.I have driven RX-7s with both systems,and I really can't tell a difference.

Chris

 

i read somewhere that the drum have a better stopping time or something..

(and iv got the lsd with drum brakes on my 7 )

 

thanks alot that helped but know my next questiion wats open and limited slip diferential????

 

im new at this whole thing if u didnt notice

 

take auto tec at your high school and you will learn all the basics.

 

An open differential only allows power to one side of the axle.Usually the tire with the least resistance.A limited slip differential allows power to travel to both rear wheels.This is the better setup.The limited slip will allow one wheel to spin at a different rate then the other like in a corner.If it didn't slip the car would hop as the outer wheel in the corner spins faster than the inner wheel.Some of roaders use a truly locked rear axle,but it isn't the best setup for a road car.Some people will weld up the "spider"gears in an open diff to make it a locked rear end,but again it isn't the optimum setup for on road use.

Oh and to answer your question on bolt pattern.It doesn't matter which axle you have(disk or drum) when it comes to the bolt pattern.The 12A engined cars had a 4X110mm bolt pattern,and the GSL-SE had a different bolt pattern maybe 4X114mm,but I could be wrong.I hope I helped.

Chris

 

thanks alot