Drums too Disks?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Drums too Disks? in Past Cadillac Vehicle Discussion; I have a 91' Sedan Deville and I have a question. all the cars Ive ever owned had Disk in ...
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    MrSmith's Avatar
    MrSmith is offline Cadillac Owners Enthusiast
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    Drums too Disks?

    I have a 91' Sedan Deville and I have a question.

    all the cars Ive ever owned had Disk in front and rear {brakes} Ive never changed drums before {thats what I now have on the Deville}. Im quite sure that once I get to know it alittle more I can do it with no problem. From what I hear and understand, Disk brakes allow you to stop alot better if you have some on both front and rear. My question is, what procedure would I have to use to change the rear drums to disks?

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    BeelzeBob's Avatar
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    Re: Drums too Disks?

    Quote Originally Posted by MrSmith
    I have a 91' Sedan Deville and I have a question.

    all the cars Ive ever owned had Disk in front and rear {brakes} Ive never changed drums before {thats what I now have on the Deville}. Im quite sure that once I get to know it alittle more I can do it with no problem. From what I hear and understand, Disk brakes allow you to stop alot better if you have some on both front and rear. My question is, what procedure would I have to use to change the rear drums to disks?
    There would be little or no point in switching to disc brakes on the rear of a 91 Deville. Unless you are using it on a race track regularily and are putting much larger front brakes on the car (larger disc brake rotors) the rear drum brakes are plenty adequate.

    The front brakes on that package do most all of the braking action and carry most all of the load. When stopping hard the weight transfer to the (already) front heavy cars unloads the rear tires sufficiently that more braking action would just lock the tires....not something that is desireable at all.

    The car was developed with the brake bias and correct brake capacity for most any situation that you can encounter so switching to disc brakes would be pointless. In addition, the parking brake setup for the car uses the drum brakes and switching to discs would involve engineering a parking brake ssytem for the disc brakes. If the system was switched over then you would also have to do some brake biasing development to get the correct bias from front to rear...

    There is really nothing to be gained with modifying to a rear disc setup on that vehicle as it will entail significant mechanical modifications including a new/different master cylinder, quite a bit of development work on the brake balance/bias of the system and will not shorten stopping distances in the least as the current system will easily lock the tires if required.

    The car can only stop as fast as the tires will allow so any braking system that can slide the tires will not benefit from more brake force.

    Upper level and performance cars use 4 wheel disc systems to add braking capacity for track use and rear wheel drive cars with more rearward weight bias can benefit from more rear braking effort but a 91 Deville is not really applicable to rear discs....that is why they were not OEM equipment.

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