Spongy Brake Pedal Fix - 1-1/16" Master Cylinder Upgrade from Cressida/T100

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Problem

MK3 Supra has a soft, spongy brake pedal with excessive pedal travel, especially noticeable after installing a big brake kit (BBK). The stock master cylinder bore is too small to provide firm pedal feel with upgraded brakes.

Spongy or soft brake pedalExcessive brake pedal travel before brakes engagePoor pedal modulation and feelBrake feel worsens after installing a big brake kit

Root Cause

The stock MK3 Supra master cylinder has a bore that is too small (under 1 inch) to provide adequate pedal firmness, particularly when paired with aftermarket big brake kits that use larger caliper pistons requiring more fluid volume.

Confidence

Moderate confidence — Multiple community members agreed on this solution

View Original Thread →Posted September 2013 on SupraForums.com