Triumph Dolomite & Sprint Brakes
The Dolomite range represents Triumph's sophisticated approach to compact executive motoring, with the Sprint delivering genuine performance car braking requirements. From the standard 1300 and 1500's servo-assisted disc brakes to the Sprint's enhanced system, proper brake maintenance ensures these cars stop as well as they perform.
What brake systems were fitted to Dolomite models?
The Dolomite range featured servo-assisted front disc brakes across all models, with different servo specifications depending on engine size and performance. The 1300 and 1500 models used smaller brake servos appropriate for their power output and weight.
The 1850 models received enhanced brake servos with improved assistance ratios, reflecting their increased performance and higher speeds. These servos provide more brake assistance than the smaller engine variants and maintain proper pedal feel.
Dolomite Sprint models featured unique brake servo specifications with higher assistance ratios to handle the 16-valve engine's performance capabilities. The Sprint servo uses specific internal components, including a Bakelite diaphragm disc that differs from other Dolomite models.
How do I identify my Dolomite's brake components?
Model identification determines the correct brake servo specification for your Dolomite. The 1300 and 1500 models share servo specifications, while the 1850 uses a larger unit with different internal ratios.
Sprint brake servos are unique to that model, featuring specific internal components that aren't shared with other Dolomite variants. The Sprint servo casing may appear similar externally, but internal specifications differ significantly.
Current parts catalogues sometimes list the same servo part number across the range, but this typically refers to the 1500 specification, which may not provide adequate assistance for higher-performance models. Always verify servo specifications before ordering replacement units.
What are the common brake servo problems on Dolomites?
Brake servo failure is common on Dolomite models, particularly the Sprint where the unique Bakelite diaphragm disc can shatter during operation. This creates a distinctive cracking sound and results in complete loss of brake assistance.
Never press the brake pedal when the master cylinder is empty or removed, as the extended pushrod travel can damage the internal Bakelite component. This advice applies particularly to Sprint servos where replacement components are scarce.
Servo casing corrosion affects many units, with approximately 50% of Sprint servos showing rust damage to the back plate. This corrosion can make rebuilding impossible, necessitating replacement with new or good used units.
Are there alternative brake servo options?
Several servo alternatives exist for Dolomite models when original units aren't available. The 1850 servo works acceptably on Sprint applications, with only marginal differences in pedal feel and braking performance.
TR6 servos can substitute temporarily for Sprint applications, though the pedal characteristics differ slightly. Many owners report satisfactory results using 1850 servos on Sprint cars, particularly when combined with uprated brake components.
Remote servo conversions using modern units provide reliable operation and improved serviceability. These systems mount away from the engine bay, reducing heat exposure and providing easier access for maintenance.
What performance brake upgrades are available?
Modern brake upgrades transform Dolomite stopping performance and keep the servo-assisted feel. Ford Sierra disc and caliper conversions provide dramatically improved braking power with readily available components.
Rear disc conversions eliminate the original drum brakes, using standard Dolomite front calipers and discs for enhanced rear braking performance. These conversions require appropriate brake bias adjustment to maintain optimal front-to-rear balance.
Competition-oriented setups may delete the servo entirely, using dual master cylinders with adjustable bias bars for precise brake balance control. This approach provides maximum pedal feel but requires increased pedal effort.
Explore our complete Dolomite parts selection for all restoration requirements, or discover brake system enhancements for improved performance. Our Triumph maintenance guide provides expert advice for maintaining these distinctive saloons.