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Re: Why does ABS system have only One rear brake line??!
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Posted by Bloodnose [Email] (#1819) [Profile/Gallery] (more from Bloodnose) on Thu, 12 Nov 2020 13:50:27 Share Post by Email
In Reply to: Why does ABS system have only One rear brake line??!, ThomasJ [Profile/Gallery] , Wed, 11 Nov 2020 09:38:51
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ABS was young for production cars at the time and is known as a three channel/four sensor ABS system. Both rear brakes are controlled as one (obviously -- with only one brake line to the rear) during slippage of either rear wheels.

Diagonal-split systems were designed to help with handling on front-wheel-drive cars during a system failure. ABS replaced the diagonal-split, probably as a decision made by engineers being charged with using the three-channel ABS.

From my experience there are no separate fluid reservoirs for the front and rear systems... I had drained the entire reservoir from the rear line. That's not to say the brakes were non-functional in this case, as the master cylinder sits below the reservoir -- I didn't experiment at the time. Also there is the hint of the rear system being somewhat isolated because of the special bleeding procedure for the rear brakes that requires activation of the ABS pump. That might have something to do with the accumulator (bomb).
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Clarence Donath
Richmond, RI
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