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

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.

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 ...