Brake Problem
Short answer: If clamping the front flex lines gives a solid pedal (and the warning light then works), the problem is at the front calipers — and the master cylinder bore size is not the issue. The likely cause: the 4-piston calipers are reversed side-to-side, trapping big air pockets.
The bleeder screws should sit horizontal at the top of the caliper; if they’re vertical, the far end of the internal passage isn’t at the top, so air can’t be bled out — which also trips the differential warning light on a hard press. Even half a caliper reversed traps air at the half fed by the connecting tube. Confirm the calipers are on the correct sides (or disassemble to see where the internal passages lead).
Any proposed updates, changes, pictures, and/or corrections, please use our comment section below (may need to click on permalink to access comments feature). Information is subject to change and offered as is without any warranties or guarantees. Please review our Term's Of Use for more information.
Content last modified: June 13, 2026 at 10:06 am
← Frequently Asked Questions
