1964½–70 Mustang 6-Cylinder Front Disc Brake Conversion Guide

If your 1964½–1970 Mustang still has its factory inline-six, 4-lug front suspension, and drum brakes, a front-disc conversion can improve serviceability and braking confidence while keeping the original 4-lug pattern. The best path depends on model year, engine, transmission, and whether you want manual or power-assisted brakes.

For most street-driven Mustangs, Relic Rides recommends doing the power-disc conversion as a complete system rather than stopping at manual front discs. Power assist reduces pedal effort and makes the car easier to drive in normal traffic. Manual front discs remain a valid option for owners who intentionally prefer a firmer, non-assisted pedal, want fewer firewall changes, or plan to add power assist later.

Fitment at a glance: 1964½–1970 Mustang

• Vehicle: 1964½–1970 Ford Mustang
• Front suspension: factory 4-lug six-cylinder setup
• Spindles: the disc kits covered here retain the original inline-six spindles
• Wheel size: minimum 14-inch wheel; actual caliper clearance must still be verified
• Bolt pattern: original 4-lug pattern is retained
• Rear brakes: rear drums can remain when the hydraulic system is configured correctly for front-disc/rear-drum operation

Important: The manual front-disc kit applies to supported 170/200 six-cylinder 4-lug Mustangs from 1964½–1970. The complete power-disc recommendation is year-specific: use the 1964½–66 power-disc kit for 1964½–66 cars, and the 1967–70 power-disc kit for 1967–70 Mustangs with the 200 ci six-cylinder.

Our recommendation: power discs for most street-driven cars

When the car is being upgraded primarily for street use, we recommend choosing the correct complete power-disc package for the year instead of buying only the front wheel-end disc hardware. You get the disc conversion and power-assist path planned together, which avoids converting to manual discs now and reworking the system again later.

Route 1: 1964½–66 Mustang complete power-disc conversion

For 1964½–66 six-cylinder cars, use the Front Power Disc Brake Conversion Kit | 4-Lug | 1964–66 Ford Mustang 6-cyl.

This is our preferred route for a street-driven 1964½–66 car when lower pedal effort is desired. Select the version that matches your transmission and preferred rotor/caliper finish. The conversion retains the 4-lug pattern and original six-cylinder spindle arrangement.

Route 2: 1967–70 Mustang 200 ci complete power-disc conversion

For 1967–70 Mustangs with the factory 200 ci six-cylinder, use the Front Power Disc Brake Conversion Kit | 4-Lug | 1967–70 Ford Mustang 200 ci 6-cyl.

This is the preferred route for most 1967–70 street-driven 200 ci cars. Choose the automatic-transmission or manual-transmission version as appropriate, then select the rotor style and caliper finish you want from the product options.

We recommend this complete 1967–70 power-disc package over starting with the manual front-disc kit unless you specifically want non-assisted brakes.

Route 3: 1964½–70 manual-disc alternative

If you specifically want to retain manual brakes, the Front Disc Brake Conversion Kit | 4-Lug | 1964–70 Ford Mustang 170/200 6-cyl is the wheel-end route for supported factory 170/200 six-cylinder 4-lug cars.

This kit bolts to the original inline-six spindles and keeps the 4-lug pattern. It is a good choice when you intentionally prefer a firmer manual-brake pedal, want to minimize firewall changes, or plan a staged build. Select the rotor and caliper-finish options you want on the product page.

What the manual front-disc kit includes

• 10.5-inch 4-lug front rotors
• Single-piston front calipers and brake pads
• Caliper mounting brackets
• Stainless front brake hoses and banjo bolts
• Wheel bearings, seals, and dust caps
• Required wheel-end mounting hardware

Already have manual discs and want to add power later?

If the car already has the front-disc hardware or you choose to build the system in stages, add the year-correct power-brake conversion:

• 1964½–66: Power Brake Conversion Kit | 1964–66 Ford Mustang
• 1967–70: Power Brake Conversion Kit with Pedal | 1967–73 Ford Mustang

Choose the correct manual/automatic transmission and front-disc/rear-drum or four-wheel-disc configuration. These standalone booster/master-cylinder packages are intended for staged conversions; if you buy the complete power-disc package for your year, do not assume you also need a separate power-brake kit.

Do not overlook the hydraulic system

The wheel-end disc conversion and the hydraulic system are separate parts of the job. A car originally equipped with four-wheel drums should not be assumed to have the correct master-cylinder and valving arrangement for a front-disc/rear-drum system.

Whichever route you choose, make sure the master cylinder, booster if used, distribution/proportioning hardware, and rear brake configuration are matched to the complete system before driving the car.

Wheel and clearance checks

The conversions covered here retain the 4-lug pattern and require at least a 14-inch wheel. Before final assembly, test-fit the wheel and confirm that the inside of the wheel clears the caliper through a full rotation. Aftermarket wheel shapes vary, so diameter alone is not a guarantee of clearance.

Installation overview

1. Confirm the car before ordering. Verify model year, engine, transmission, factory-style 4-lug front suspension, and the hardware currently on the car.
2. Choose the correct route. For most street cars, select the year-correct complete power-disc kit: Route 1 for 1964½–66 or Route 2 for applicable 1967–70 200 ci cars. Choose Route 3 only when non-assisted brakes are intentional.
3. Verify wheel clearance. Confirm at least 14-inch wheels and test-fit for caliper clearance.
4. Install the disc hardware. Follow the manufacturer's instructions for brackets, bearings/seals, rotors, calipers, pads, and hoses.
5. Install/configure power assist and hydraulics if applicable. Select the correct transmission and front/rear brake configuration and follow the kit's firewall/pedal/master-cylinder instructions.
6. Bleed and inspect the system. Bleed thoroughly and check every connection for leaks, hose interference, or binding through the full steering range.
7. Verify fasteners and clearance. Use component-manufacturer or applicable Ford service torque specifications and rotate each wheel by hand before lowering the car.
8. Test before normal driving. Confirm a firm, consistent pedal while stationary, then perform controlled low-speed testing in a safe area and re-inspect the system.

Brake work is safety-critical. If you are not equipped to verify fitment, hydraulic compatibility, line integrity, bleeding, and fastener torque, have a qualified technician perform or inspect the installation.

Common questions

Which kit does Relic Rides recommend?

For most street-driven cars, we recommend a complete power-disc conversion: Route 1 for 1964½–66 six-cylinder cars, or Route 2 for applicable 1967–70 200 ci six-cylinder cars. Route 3, the manual front-disc kit, is the alternative when the owner intentionally wants non-assisted brakes.

Which 1967–70 power-disc version should I choose?

Select the version that matches your transmission first, then choose your preferred rotor style and caliper finish from the available product options.

What if my 1967–70 Mustang has a manual transmission?

Select the manual-transmission version of the 1967–70 200 ci six-cylinder power-disc kit, then choose the rotor and caliper-finish combination you prefer.

When should I choose the manual front-disc kit?

Choose the 1964½–70 manual front-disc kit when you intentionally want non-assisted brakes, prefer a firmer pedal feel, want to minimize firewall changes, or plan to add power assist later.

Do I need V8 spindles?

No. The six-cylinder 4-lug disc kits covered here are designed around the original inline-six spindle arrangement.

Can I keep my 4-lug wheels?

Yes. These conversions retain the 4-lug pattern. A minimum 14-inch wheel is required, but always confirm actual caliper clearance.

Do I have to convert the rear brakes to discs?

No. A front-disc/rear-drum setup is valid when the master cylinder and brake valving are configured correctly for that combination.

Recommended parts for this conversion

1964½–66 Front Power Disc Brake Conversion Kit | 4-Lug | 6-cyl
Our preferred route for 1964½–66 street-driven six-cylinder cars when power assist is desired. Choose the version that matches your transmission and preferred rotor/caliper finish.

1967–70 Front Power Disc Brake Conversion Kit | 4-Lug | 200 ci 6-cyl
Our preferred route for supported 1967–70 200 ci cars. Select the manual- or automatic-transmission version, then choose the rotor style and caliper finish you prefer.

1964½–70 Front Disc Brake Conversion Kit | 4-Lug | 170/200 6-cyl
The manual-brake alternative for supported 170/200 six-cylinder 4-lug cars. Choose your preferred rotor and caliper-finish options on the product page.

For staged conversions, the matching standalone power-brake kits are shown in the Complete the Job section below.