The MGA's braking system changed significantly during production, and this category covers the upgrades and alternative components that allow owners to improve braking performance beyond original specification. Understanding which variant a car is, and how its brakes were originally configured, is essential when selecting an upgrade, as the starting point differs considerably across the range.
The Drum-to-Disc Transition
The original MGA 1500 was fitted with Lockheed drum brakes on all four wheels. With the introduction of the 1600 in 1959, front disc brakes were adopted while drums were retained at the rear, a substantial improvement in stopping power that carried forward to the 1600 Mk II.
This means a 1500 starts from an all-drum configuration, whereas the 1600 and Mk II already benefit from front discs. The most significant upgrade available to a 1500 owner is therefore the addition of front disc brakes, bringing the car's braking closer to that of the later pushrod variants.
The Twin Cam Exception
The MGA Twin Cam was unique in being fitted with Dunlop four-wheel disc brakes, the only MGA variant with discs all round. These were paired with centre-lock Dunlop disc wheels and form a system entirely distinct from the pushrod cars. Twin Cam braking components are specialised and not interchangeable with the drum or front-disc pushrod variants, and any work on a Twin Cam braking system must be approached with this in mind.
Front Disc Conversions for Drum Cars
For owners of drum-braked 1500s, front disc brake conversion is the principal upgrade. This typically involves changing the front hubs, stub axles or backplates and the associated braking components to accept discs and calipers, dramatically improving fade resistance and pedal feel under repeated heavy braking. Conversions are designed to suit the MGA's front suspension, but it is important to confirm compatibility with the car's existing wheels, as disc conversions can affect wheel fitment and clearance.
Uprated Components and Materials
Beyond full conversions, braking performance can be improved through uprated friction materials, braided flexible hoses in place of original rubber, and servo assistance where appropriate. Braided hoses give a firmer, more consistent pedal by eliminating the swelling associated with aged rubber lines. These improvements are applicable across the variants and are often combined with a system overhaul during restoration.
Matching the Upgrade to the Car
The correct upgrade path depends entirely on the car's variant and original specification. A 1500 owner is most concerned with gaining front discs; a 1600 or Mk II owner is more likely to focus on refreshing or uprating the existing disc/drum system; and a Twin Cam owner is working within a specialist four-wheel disc setup. Identifying the car accurately before ordering ensures the right components and avoids mismatched or incompatible parts.