floattuber
Mechanical
Why do manufacturers use drum brakes on passenger cars/trucks rather than disk brakes? Because of their simplicity, it seems like disks would be cheaper to build plus they stop better. What advantage do they have over disks?
Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Why drum brakes? 3
- Thread starter floattuber
- Start date
- Status
NormPeterson
Structural
Pat, at least some of the mechanisms that apply rear pads have proven to be somewhat less than good. In severe cases the pad(s) will over-adjust and then not retract leaving you with a very warm wheel or one that stops rolling. Cost me a caliper on my '95 Mazda a couple of years ago, remanufactured because it is no longer available new.
I'm not sure I follow the complaint regarding reducing the rear brake bias by 40%. The harder you stop the less you want the rear brakes to be contributing. But if brake bias is always biased to the front to suit the most severe braking the rears will be under-utilized in easier events (which is arguably the majority of the time for production vehicles).
Norm
I'm not sure I follow the complaint regarding reducing the rear brake bias by 40%. The harder you stop the less you want the rear brakes to be contributing. But if brake bias is always biased to the front to suit the most severe braking the rears will be under-utilized in easier events (which is arguably the majority of the time for production vehicles).
Norm
patprimmer
New member
Norm
I did specify if designed correctly. I know some are no correctly designed.
I would thin it is more important for the brakes to be balanced on the rare occasion that they ar used hard than on the many occasions they are used lightly. I base this on the potential for the cost of the consequences vs the likelihood of the results.
Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &
for site rules
I did specify if designed correctly. I know some are no correctly designed.
I would thin it is more important for the brakes to be balanced on the rare occasion that they ar used hard than on the many occasions they are used lightly. I base this on the potential for the cost of the consequences vs the likelihood of the results.
Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &
for site rules
NormPeterson
Structural
Precisely why there are proportioning valves, since bilinear biasing is better than no variability at all. I don't think this is confined to rear disc brake systems, as I replaced a prop valve in a disc/drum braked car about four years ago.
Norm
Norm
If your interested in brake bias....Watch till the very end.
Just one of the reasons I have an adjustable prop valve on the rear drum brakes...
Rod
Just one of the reasons I have an adjustable prop valve on the rear drum brakes...
Rod
patprimmer
New member
Do you think they needed a bit more anti dive.
Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &
for site rules
Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &
for site rules
- Status
Similar threads
- Locked
- Question
- Locked
- Question