⟲ 360° — drag meThe facts.
| Part number | GA001 |
|---|---|
| Type | Radial brake master cylinder (counter-thrust hydraulics) |
| Piston diameter | 19 mm |
| Lever ratio | 17-18-19 mm (adjustable) |
| Lever | Folding, long, with relieving eyelet (RST), 6 colours |
| Body | Machined from solid billet aluminium |
| Clamp | Quick-opening clamping sleeve |
| Hydraulic system | Self-purging, self-refilling counter-thrust |
| Road approval | No German approval documented |
DescriptionThe whole story▼
The Accossato GA is a radial brake master cylinder built around a patented counter-thrust hydraulic system rather than the conventional layout used across the rest of the range, aimed at riders who want to push braking performance beyond what a standard radial master cylinder can offer. The 19 mm piston is paired with the familiar PRS adjustable lever pivot, selectable between 17, 18 and 19 mm, while the counter-thrust design lets the unit purge and refill its own brake fluid without the usual servicing routine. Machined from solid billet and assembled in Italy, the GA master cylinder is fitted with a long folding lever available in six colours.
Key Features
- 19 mm piston diameter, matched to the PRS 17-18-19 mm adjustable lever pivot
- Patented counter-thrust hydraulic system, self-purging and self-refilling with brake fluid
- Up to ten times faster release of pad pressure than a conventional master cylinder
- Reduced free travel at the lever for a more direct, modulable feel
- Folding lever, long version, with relieving eyelet (RST), six colours available
- Machined from solid billet aluminium, fully made in Italy
- Quick-opening clamping sleeve on the fixing riser
- Suitable for motorcycles with dual-disc front brakes
Construction and Material Quality
The GA master cylinder is machined from solid billet rather than built up from a standard casting, which is how Accossato describes the level of finishing behind this unit within the radial brake range. The fixing riser uses a quick-opening clamping sleeve rather than the simple offset bracket fitted to the rest of the lineup, reflecting the fact that this master cylinder is built around an entirely different internal hydraulic principle. Accossato states that the counter-thrust system is an exclusive patent developed after years of testing, intended to change how radial racing master cylinders handle fluid rather than being an incremental update of the existing Ready To Brake or PRS designs.
What the Counter-Thrust Hydraulic System Changes
Where a conventional master cylinder simply pushes fluid down the line each time the lever is pulled, the Accossato GA's counter-thrust hydraulics work the other way around: the unit purges itself and tops its own brake fluid back up without the rider needing to bleed the system by hand. Accossato credits this layout with reducing the free travel at the lever to close to zero and with releasing pressure on the pads up to ten times faster than a traditional radial master cylinder once the lever is released, while also increasing overall braking power and keeping the modulation of that power high. The 19 mm piston is specified for motorbikes running dual-disc front brakes with an adjustable 17-18-19 mm pivot distance, so the rider can still fine-tune lever feel on top of the hydraulic advantage the GA design is built around.
Fitment and Compatibility
No specific vehicle list is published for the Accossato GA, and our fitment data carries no vehicles against this code; it is a universal 19 mm radial brake master cylinder for dual-disc front brake systems. Before ordering, check that your handlebar clamp is 22 mm in diameter, that your brake system is set up for dual-disc operation, and that a 19 mm piston matches the calliper and disc combination already fitted to your motorcycle.
Road Approval
This master cylinder is not supplied with German road-approval documentation; it is intended for track and competition use.
Scope of Delivery
The package includes the Accossato GA radial brake master cylinder with its counter-thrust hydraulic system, fitted with a long folding lever and relieving eyelet (RST) in the colour selected, together with the mounting nut. The quick-opening clamping sleeve and the stainless steel mounting hardware are assembled on the unit as supplied.
Specifications
- Part number: GA001
- Type: Radial brake master cylinder (counter-thrust hydraulics)
- Piston diameter: 19 mm
- Lever ratio: 17-18-19 mm (adjustable)
- Lever: Folding, long, with relieving eyelet (RST), 6 colours
- Body: Machined from solid billet aluminium
- Clamp: Quick-opening clamping sleeve
- Hydraulic system: Self-purging, self-refilling counter-thrust
- Road approval: No German approval documented
DownloadsData sheet▼
FitmentWhich bikes this fits▼
Questions, one topic at a time.
Get the real shipping cost for this item to your address — the same rates as checkout.
Choose a destination and hit Estimate — we fetch the live rates for this item.
We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.
Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.
Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.
Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.
As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.
On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.
You have the right to cancel within 14 days of receiving your order. Register your return by email first; once it’s approved you have a further 14 days to send the goods back. Items should be unused and in their original packaging.
Register your return by email with your order number before sending anything back, and we’ll send you the return instructions. Please note: returns that aren’t registered in advance can’t be accepted.
The quickest way is to place a new order for the size you need and register a return for the original by email — just let us know it’s an exchange.
We’re sorry — that shouldn’t happen. Contact us with your order number and a photo as soon as you can, and we’ll arrange a replacement or refund right away. Faulty goods are always covered by your statutory warranty.
Refunds go back to your original payment method, usually within 3–5 working days of your return reaching our warehouse.
PayPal, all major credit and debit cards (Visa, Mastercard, American Express), Klarna (pay later and instalments), Apple Pay, Google Pay and more — all processed securely via PayPal and Mollie.
Yes. Choose Klarna at checkout to split your purchase into flexible monthly installments.
Your payment is taken when you place your order. If you choose Klarna, you pay later according to Klarna’s terms.
Every payment runs over an SSL-encrypted connection through certified providers. We never see or store your full card details.
If your order hasn’t shipped yet, contact us as soon as possible and we’ll do our best to change or cancel it.
No — you can check out as a guest. An account simply lets you track orders and reorder faster.
For customers in the EU, prices are shown including your country’s local VAT. For customers outside the EU, prices are shown without VAT — instead, your country’s import taxes and duties may apply on delivery (see the customs question).
Yes. Your invoice is attached to your order confirmation email and is also available in your account.
Yes. We’re an authorised dealer, so every product is 100% original and comes with the full manufacturer warranty.
Yes. Everything we sell is genuine and comes with the manufacturer’s warranty, on top of your statutory rights. Keep your invoice as proof of purchase and contact us if you ever need to make a claim — we’ll help you through it.
Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.