but like brake calipers, sometimes it can spring leaks or otherwise fail, and it must be rebuilt or replaced. The master cylinder is topped by the brake-fluid reservoir, which must be kept full.

Chevy Trax units will need a master brake cylinder replacement to correct reduced brake performance, according to a recent GM service update.

Certain reservoir tank caps on the brake master cylinder were produced with a worn ... Dealers will inspect the reservoir cap and replace it, if necessary. The manufacturer has reported that ...