The brake system of the Alfa Romeo 105 series is designed the same way across the series and is used in the Giulia, Berlina, GT Bertone and Spider 105/115. Characteristic are disc brakes on all four wheels with a vacuum brake servo - an advanced feature for the period. As a manufacturer, supplier and spare parts specialist for classic Alfa Romeo models, Alfa-Service carries a comprehensive range of brake components. Many parts are comparable across the series, while individual versions differ by model year, engine and system.
Alfa Romeo 105 Brake System at a Glance
The 105 models come as standard with disc brakes front and rear, a brake servo and a hydraulic circuit with master cylinder. The handbrake acts mechanically on the rear discs and is integrated into their inner area. This basic design was retained across the whole series, which is why many components fit across models.
Brake Part Types
The range is divided into the following part types:
- Brake discs front and rear
- Calipers and caliper parts
- Brake pads
- Master cylinder and wheel cylinders
- Brake servo and associated parts
- Brake lines, hoses and unions
- Reservoirs and seals
- Handbrake cable and handbrake parts
Shared Across the Series or Model-Dependent
The basic brake system is the same across the series, but there are clearly definable differences. Early cars were fitted with a Dunlop system; from 1967 a switch was made to an ATE system, which uses different calipers, discs and line routing. In addition, brake components partly differ by engine: cars with 1750/2000 received larger brakes than early 1300 and 1600 versions. When selecting discs, calipers and pads, it is therefore important to check whether the car has the Dunlop or the ATE system and which engine is fitted.
Model Families
For a model-specific selection, the following categories lead to the model families:
Brake Systems, Model Years and Model Variants
Within the common basic design, the brake systems of the 105 series can be clearly ordered by system and model year. Early cars were delivered with a Dunlop system. As this system required frequent adjustment, a switch was made to an ATE system from 1967. The Dunlop and ATE versions differ in the calipers, in the diameter and thickness of the discs and in the line routing. Brake line sets are also made separately for left-hand and right-hand drive, because the routing differs.
The engine also has an effect: cars with 1750 and 2000 received larger brakes than early 1300 and 1600 models. When moving from the early to a later system, the discs, calipers, master cylinder and lines therefore change together. The brake servo on many cars is by Bonaldi; some early 1600s were built as a single-circuit system without a servo. Such differences must be taken into account when selecting the caliper, disc and master cylinder.
The handbrake acts mechanically on the rear discs and is integrated into their inner area; the corresponding handbrake cable and actuation parts are listed as their own part type. Even seemingly small points such as the fixing of the wheel studs can differ between early and late discs. For a clear assignment, it is advisable to first establish the brake system (Dunlop or ATE) and then the engine and model year before selecting discs, calipers, pads and lines.
In practice, the brake components can be divided into clearly defined part types that can each be assigned specifically. Brake discs come in front and rear versions, each with system- and engine-dependent dimensions. Calipers differ by Dunlop or ATE and by front or rear position. Pads are chosen to match the respective caliper. In addition there are the master cylinder, where applicable wheel cylinders, the brake servo, brake lines and hoses, reservoirs as well as seals and repair-kit parts. This division makes it easier to put together a complete and matching selection.
As the Giulia, Berlina, GT Bertone and Spider 105/115 use the same basic system, many of these parts are comparable across the series. Decisive, however, remains the combination of system, engine and model year. Anyone who clarifies these three points in advance can put together discs, calipers, pads, cylinders and lines reliably and without wrong purchases. In case of doubt, comparing with the specific vehicle helps, for example using the existing calipers and the line routing.
Related Assemblies
The following areas are also relevant:
Notes on Part Selection
Decisive are the brake system (Dunlop up to 1967 or ATE thereafter), the engine (1300, 1600, 1750, 2000) and the model year. These determine the diameter and thickness of the discs, the type of calipers and pads and the line routing. Checking against the specific vehicle is recommended in order to choose the correct version.
FAQ
Did the 105 models have disc brakes all round?
Yes. Giulia, Berlina, GT Bertone and Spider 105/115 come as standard with disc brakes front and rear with a brake servo.
How do the Dunlop and ATE systems differ?
Early cars had a Dunlop system; from 1967 a switch was made to ATE. Calipers, discs and lines differ accordingly.
Are brake parts usable across the series?
The basic design is the same, but the system (Dunlop or ATE) and the engine determine individual parts such as discs and calipers.
Where is the handbrake?
The handbrake acts mechanically on the rear discs and is integrated into their inner area.
Is Alfa-Service a workshop?
No. Alfa-Service is a manufacturer, supplier and spare parts specialist for classic Alfa Romeo models and does not carry out repairs.
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