GD898 EBC GD Rear Brake Discs Opel Astra Mk5 GTC. EBC GD Rear Brake Discs. EBC Part Code: GD898. Opel Astra Mk5 GTC 1.6 [116bhp] (H). Quantity Supplied: 2 Discs. Fits Models with: Girling/TRW Calipers. Height (Laid Flat): 42mm. This listing is for a rear axle set of EBC 240mm GD Rear Brake Discs to fit models fitted with Girling/TRW brake calipers. IMPORTANT The item specifics above must exactly match the discs currently fitted to your vehicle. Matching Brake Pad Codes. EBC offer the following matching brake pads to compliment these brake discs.. EBC GD Grooved Series Brake Discs feature a unique wide (high volume) slotted grooved design. These specially machined grooves allow brake dust, debris, gasses and carbon deposits to be spun off from the braking disc surface which improves braking efficiency. The dimples prevent cracking and help to break down surface gasses, further improving braking efficiency under heavy load. The grooves also help to increase brake pad friction which in turn reduces stopping distances quite significantly. EBC GD Discs are manufactured using a high-quality alloy designed to run up to 900 degrees centigrade (glowing red hot). EBC GD discs are designed for fast road, light race, rally and track day use. Combine these EBC GD discs with EBC GreenStuff, RedStuff (Ceramic) or YellowStuff pads to increase braking efficiency and reduce stopping distances even more! We sell over 250,000 performance car parts online! Sadly, it is impossible for us to stock all of these parts all of the time and ultimately this would only lead to increased prices. Sometimes a part may have to be manufactured or even imported from another country for you. Where we are informed of a delay we will do our best to keep you updated. We cannot guarantee product availability. Please do not schedule any work on your vehicle until you have received and fully inspected your parts.